Cc: [email protected] >? ? ? ? Sent: Saturday, December 28th 2024,

? more prominent in the green filtered images than in unfiltered (or >

? I have missed 90% of the comets coma flux in my measurement - which would be >? the case if the magnitude were near ~11.6mag - though I

? Anyway, I'd like to encourage anyone to continue monitoring the

? > Obviously, I am also interested in the confirmation of the large

? > >? > Best regards, >? > >? > J. J. Gonzalez Suarez >? > >? > P.S.: ? > >? > As complementary information, this is the report of my recent? observation >? > of the large dust coma of 29P : >? > >? >

? > >? > >? > On Sat, Dec 28, 2024 at 5:39?AM Alan Hale via groups.io [email protected]> wrote: >? >? >? > > Dear Denis,

? > > >? > > >? > > >? > > Sincerely, >? > > >? > > Alan >? > > >? > > ? > > >? > > Hello all, >? > > >? > > I must admit I am a little

? > > the months of November and December (10 nights data) show the? >

? > > this comet with a magnitude of 11.6. >? > > >? > > My last

? > > measurement gives a magnitude of 15.73 with a coma diameter of

? > >? Can someone confirm the apparent +4 mag increase in brightness? or of >? > > >? > > mine, Peter Carson's and Francois Kugel's

? Happy NY >? > > >? > > Denis Buczynski >? > > >? > > BAA Comet

? > > >? > >? ? ? ? Sent: Friday, December 27th 2024, 23:52 >? > > >? > ? ? ? ? Subject: Re: [comets-ml] Unusual brightening of comet? >

:C/2023 Q1 (PANSTARRS):2024 Dec. 27.81 UT: m1=11.6, Dia.=6',? >

? > > comet : 14.2 (AQ).].( Cubiellos - Sierra del Aramo, 1510 m,? >

? > > >? > > >? > > >? > > >? > > >? > >? On Fri, Dec 27, 2024 at

? > > November was: >? > > >? > >? ? 2023 Q1 (PANSTARRS) observations

? > > >? > > >? > >? ? Jonathan Shanklin >? > > >? > >? ? BAA Comet

? > > >? > > >? > > >? > >? ? ? From: [email protected]

? > > >? > >? ? ? ? You don't often get email from >? > > >? > >

? > > >? > > >? > > >? > > >? > > >? > > >? > >? ? Hello Thomas, >? > > ? > > >? > > >? > >? ? Here are my observations from summer to now.

? > > long period. >? > > >? > > >? > > >? > > >? > > >? > > >? > > >?

? ? All the best >? > > >? > > >? > > >? > >? ? Peter >? > > >? > >

? > > >? > > >? > > >? > > >? > > >? > >? ? Type Comet Obs? ? ? ? ? ? ?

? > > >? > > Observatory Z10, Fregenal de la sierra, Spain >? > > >? >

? > > >? > >? ? CCD C/2023 Q1 10/12/2024 >? > > >? > > 03:18 Z 15.9

? > > >? > > Observatory Z10, Fregenal de la sierra, Spain >? > > >? >

? > > >? > >? ? CCD C/2023 Q1 04/09/2024 >? > > >? > > 01:48 Z 17.5

? > > Observatory Z10, Fregenal de la sierra, Spain >? > > >? > >

? > > >? > >? ? CCD C/2023 Q1 05/08/2024 >? > > >? > > 02:33 Z 17.4 GG

? > > >? > > 02:52 Z 17.5 GG C 31.5 8 1080 0.40' CAR06 PGC >? > > >? > Observatory Z10, Fregenal de la sierra, Spain >? > > >? > > >? > > >?

? ? CCD C/2023 Q1 10/07/2024 >? > > >? > > 02:39 Z 17.5 GG C 31.5 8

? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > >? ?

? > > >? > > Lehmann via groups.io <t.lehmann@...>

? > > >? > >? ? ? According to observations by S. Fritsche and myself

? > > 26th and November 30th.? Latest measurement (green channel):

? > > >? > > 2024-12-23.46 UT, m1=14.1, coma diam. 5'? A more thorough? investigation >? > > >? > > by using small aperture measurements is on

? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > > >? >

? ? ? This email and any attachments are intended solely for the? >

? > > your system. UK Research and Innovation (UKRI) has taken

? > > accept any liability for any losses or damages which the

? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > > >?

? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > > >? >

? > > >? > > >? > > >? > > >? > > >? > > >? > > >? > >? >? > >? > >? ? > >? >? > > >? > > > > > > > > > >

Hi Christophe,

Using a geocentric Horizons ephemeris, Comet P/2022 L3 (Atlas) was at 02 12 03.40 +23 40 42.1 on 2022 11 16.685 UTC, quite close to the position you've given below.

Peter
J95

On 29/12/2024 09:25, cmltb612 via groups.io wrote:

Hello happy comet enthousiasts !

I was performing some photometry on a variable star (Hip10272, in Aries) in some TICA TESScuts, sector 58, when I came upon a quite nice comet slowly crossing the FOV, in a corner of the images.

I did a quick search using Patrick Chevalley's CdC, but could not find any valuable comet candidate to match this beauty.

This comet had a condensed head, about 60'', and maybe a 15' tail, all in all.

I did a photometry in a 1.5 pixel around the centroid of the coma, and get a mean value of 15.32 mag on 74 sub images, so in a 30'' circle, using AIJ. This coma magnitude is in pseudo V, or CV. The mag of the comps stars were in V, but I've some doubts about the original bandpass of the TESS data.

I managed to found a FOV where the comet is traveling dead in the center of the images, and releved an (approximative) astrometric position when the comet just crossed the right center of the FOV, unfortunatelly in front of a mag 13 star.

slice/date (BJD)/ RA/ DEC

7276 2459899.584 021203.4 +234004.3

The TICA sector 58 can be downloaded from here :

If you enter the position 33.133098 23.671662, you'll download the same FOV than mine.

Here are a few images.

Any advice on how to find the name of this comet is welcome.

Thanx in advance.

Clear skies,

Christophe

Hello happy comet enthousiasts !

I was performing some photometry on a variable star (Hip10272, in Aries) in some TICA TESScuts, sector 58, when I came upon a quite nice comet slowly crossing the FOV, in a corner of the images.

I did a quick search using Patrick Chevalley's CdC, but could not find any valuable comet candidate to match this beauty.

This comet had a condensed head, about 60'', and maybe a 15' tail, all in all.

I did a photometry in a 1.5 pixel around the centroid of the coma, and get a mean value of 15.32 mag on 74 sub images, so in a 30'' circle, using AIJ. This coma magnitude is in pseudo V, or CV. The mag of the comps stars were in V, but I've some doubts about the original bandpass of the TESS data.

I managed to found a FOV where the comet is traveling dead in the center of the images, and releved an (approximative) astrometric position when the comet just crossed the right center of the FOV, unfortunatelly in front of a mag 13 star.

slice/date (BJD)/ RA/ DEC

7276 2459899.584 021203.4 +234004.3

The TICA sector 58 can be downloaded from here :

If you enter the position 33.133098 23.671662, you'll download the same FOV than mine.

Here are a few images.

Any advice on how to find the name of this comet is welcome.?

Thanx in advance.

Clear skies,

Christophe

Dear all,

?

I was debating whether or not I wanted to wade into this again, but I guess my curiousity got the better of me.

?

I’m attaching two stacked versions (3 x 180 seconds) of all the images I took the other night (one positive, one inverted, i.e., negative). I have also enhanced the contrast beyond any reasonable view, and applied logarithmic scaling.

?

On those images, especially the inverted one, I can perhaps see hints of an extremely faint and vague outer coma. A generous measurement makes the diameter out to about 2 arcminutes, 2.5 arcminutes at the most.

?

I have been visually observing comets for over five decades, and have imaged dozens of comets (of a wide variety of brightnesses) via LCO over the past seven years now. Based upon that experience, there is simply no way that this outer coma on C/2023 Q1, if real – and I’ll grant for the sake of argument that it is – can be detected visually with a telescope the size of mine (41 cm) or smaller.

?

FWIW, Astrometrica measures a magnitude of 16.0, although this is primarily for the central regions.

?

And as for 29P, the comparison is definitely valid. The visual appearance was indeed very vague and diffuse (again, I measured a DC of 1). This is the same material that was contained within a coma 2 arcmin in diameter a month ago (when I measured an almost identical brightness), now spread out over a region almost six times larger in surface area.

?

?

Sincerely,

Alan

?

?

?

Thomas, Denis, Peter, Jakub, all,

Some recent further visual data :

C/2023 Q1 (PANSTARRS):
2024 Dec. 28.82 UT: m1=11.7 (AQ), Dia.=6', DC=1/, 20 cm SCT (77x).
[ Faint, large and very diffuse outer coma, slightly enhanced through Swan Band filter. Nearby field stars checked in DSS. At 133x : m=13.3 (AQ) for the 1' inner coma diameter. Limiting star magnitude near comet : 14.5 (AQ). Mountain location, very clear sky.].
( Collada de Aralla, 1500 m, Leon, Spain )

And other comments ?:

Denis, in your posts ?in this thread you mention the word "debate". For my part, by contributing my data I do not want to discuss the photometric measurements obtained with CCD/CMOS, I only add complementary information from another perspective ...
On the other hand, the mentioned visual estimates of C/2023 Q1 and 29P cannot be compared, even if they are now of similar magnitude m1 and apparent diameter : the comae structure and composition are different, and Q1 is more diffuse.

Thomas, I fully agree with you : "The aperture diameter MUST be taken into account when comparing data. The second important parameter is the spectral range covered."
But regarding your report ( 2024-12-23.46 UT, m1=14.1, coma diam. 5'), I obviously disagree when you say "I would be very much surprised if it would be possible to detect the same amount of coma size visually".

Best regards,

J. J. Gonzalez Suarez

---------------------------------------------------------------------------------

?

?

On Sun, Dec 29, 2024 at 12:07?AM Observatory Gr?mme via <observatorygromme=[email protected]> wrote:

Dear All,

?

For the moment i measure magnitude 16 using SDSS r' filter. Uncalibrated images. PhotAp 6.1arcsec

?

---

From: [email protected] <[email protected]> on behalf of David Moore(Ireland) via <davefriend0=[email protected]>
Sent: Saturday, December 28, 2024 2:19 PM
To: [email protected] <[email protected]>
Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1

?

Skyglow?

?

If coma diameter is 4' that's 45,000 sq "

I think I saw a figure of 21mag per sq arcsec?

So airglow alone would 'add' 11.6mag i.e. a patch of dark sky 4' in diameter is mag9.4?

?

Is my maths wrong!?

?

?

On Saturday 28 December 2024 at 12:05:34 GMT, Thomas Lehmann via <t.lehmann=[email protected]> wrote:

?

?

Hi Denis,

here is a heavily processed image. Pretty ugly though, but it might serve for
illustration purposes.

Something I'd add to my "total" coma mesurement within 5': the brighness
measurement (statistical) uncertainty is about 0.15mag.

Best wishes
Thomas


> Am Sat, 28 Dec 2024 11:43:28 +0000 (GMT)
> schrieb "Denis Buczynski via " <buczynski8166=[email protected]>:
>
> Hi Thomas,
> I appreciate all you say in this regard.
> I would be more convinced that there was an extensive coma present if I
> could see an image showing this coma. Whether it be from fast f/2
> telescopes in excellent dark skies or from anywhere else . It only
> requires someone posting a current image showing an extensive coma to
> put this "debate " to rest.We have yet to see one.
> Best wishes
> Denis Buczynski
>
>
>? ? ? ? ------ Original Message ------
>? ? ? ? From: t.lehmann=[email protected]
>? ? ? ? To: jjgsgp=[email protected]
> Cc: [email protected]
>? ? ? ? Sent: Saturday, December 28th 2024, 11:17
>? ? ? ? Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1
>
>
>
>? Dear all,
>
>? thanks for the numerous observation reports, especially to Denis's and
> Peter's
>? measurements over longer time span.
>
>? I'd like to emphasize that any brightness measurement MUST be read in
>? conjunction to the measurement aperture used. The aperture diameter
> MUST be
>? taken into account when comparing data. The second important parameter
> is
>? the spectral range covered. The brightening from gaseous outbursts can
> be
>? more prominent in the green filtered images than in unfiltered (or
> red) images.
>
>? About visual estimates.
>? My report of 2024-12-23.46 UT, m1=14.1, coma diam. 5'
>? is derived from images using a fast f/2.2 scope under excellent skies
> having
>? a limited stellar magnitude of 21mag and using heavy smoothing and
> contrast
>? enhancement. I would be very much surprised if it would be possible to
> detect
>? the same amount of coma size visually. It is even harder for me to
> accept that
>? I have missed 90% of the comets coma flux in my measurement - which
> would be
>? the case if the magnitude were near ~11.6mag - though I cannot rule
> out some
>? additional outburst has happened recently.
>
>? Anyway, I'd like to encourage anyone to continue monitoring the comet.
>? For those doing imaging, it would be nice if you could measure the
> coma
>? additionally using a true aperture diameter of d=15000km and 30000km
> at the
>? comet (and report filter information) so we would be able to construct
> a
>? combined light curve of the inner coma brightness.
>
>? Thanks
>? Thomas
>
>
>? > Am Sat, 28 Dec 2024 07:54:29 +0100
>? > schrieb "jjgonzalez jjgonzalez via "?
> <jjgsgp=[email protected]>:
>? >
>? > Thomas, Denis, Alan, all,
>? >
>? > Obviously, I am also interested in the confirmation of the large and?
> very
>? > diffuse gas coma by visual observers from dark skies.
>? >
>? > Best regards,
>? >
>? > J. J. Gonzalez Suarez
>? >
>? > P.S.:
>? >
>? > As complementary information, this is the report of my recent?
> observation
>? > of the large dust coma of 29P :
>? >
>? > 29P/Schwassmann-Wachmann:
>? > 2024 Dec. 27.00 UT: m1=11.1, Dia.=4', DC=2/, 20 cm SCT (77x).
>? > ( Cubiellos - Sierra del Aramo, 1510 m, Asturias, Spain )
>? >
>? >?
> -----------------------------------------------------------------------------------------------------------
>? >
>? >
>? > On Sat, Dec 28, 2024 at 5:39?AM Alan Hale via
> [email protected]> wrote:
>? >?
>? > > Dear Denis, all,
>? > >
>? > >
>? > >
>? > > I’m attaching an image I took of C/2023 Q1 via LCO-Tenerife on?
> December
>? > > 26.97 UT (0.35-m Cassegrain, single 180-second image, unprocessed,
>? > > uncropped (dimensions 30x30 arcmin)). I’ve had some trouble?
> getting
>? > > measurements from the image (possible software issues), but would
>? > > “guesstimate” the magnitude to be somewhere around 15-15.5. I had?
> not
>? > > imaged the comet previously so I can’t comment about any recent?
> brightening.
>? > >
>? > >
>? > >
>? > > For comparison, I’m also attaching an image I took of 29P on?
> December
>? > > 25.60 UT from LCO-Haleakala (0.35-m Cassegrain, single 150-second?
> image,
>? > > also unprocessed and uncropped, 30x30 arcmin). About eight hours?
> before I
>? > > took this image I observed the comet visually at m1 = 11.7, 5.5’?
> coma, DC
>? > > ~1 (41 cm reflector, 70x).
>? > >
>? > >
>? > >
>? > >
>? > >
>? > > Sincerely,
>? > >
>? > > Alan
>? > >
>? > >
>? > >
>? > > Hello all,
>? > >
>? > > I must admit I am a little baffled by these reports of a?
> substantial
>? > >
>? > > increase in brightness of C/2023 Q1.
>? > >
>? > > Firstly Thomas? Lehmann reported an increase in the brightness of?
> this
>? > >
>? > > comet in November to mag 14.1 My observations made for astrometry?
> for
>? > >
>? > > the months of November and December (10 nights data) show the?
> comet only
>? > >
>? > > increasing from mag 17 to mag 16.
>? > >
>? > > This is borne out by Peter Carson and Francois Kugel's comments of?
> their
>? > >
>? > > own observations and measurements.
>? > >
>? > > Now JJ Gonzalez is reporting an observation on the night of Dec 27?
> of
>? > >
>? > > this comet with a magnitude of 11.6.
>? > >
>? > > My last observation was a day or so earlier on Dec 25 and my?
> Comphot
>? > >
>? > > measurement gives a magnitude of 15.73 with a coma diameter of 34?
> arc
>? > >
>? > > secs.
>? > >
>? > > I attach my image.
>? > >
>? > >? Can someone confirm the apparent +4 mag increase in brightness?
> or of
>? > >
>? > > mine, Peter Carson's and Francois Kugel's observation results?
>? > >
>? > >
>? > >
>? > > Comets eh!
>? > >
>? > >? Happy NY
>? > >
>? > > Denis Buczynski
>? > >
>? > > BAA Comet Section
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? ? ------ Original Message ------
>? > >
>? > >? ? ? ? From: jjgsgp=[email protected]
>? > >
>? > >? ? ? ? To: [email protected]
>? > >
>? > >? ? ? ? Sent: Friday, December 27th 2024, 23:52
>? > >
>? > >? ? ? ? Subject: Re: [comets-ml] Unusual brightening of comet?
> C/2023 Q1
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? Thomas, all,After reading your email sent to the list yesterday,?
> I
>? > >
>? > > have arranged an observing session for tonight. This is the report
>? > >
>? > > :C/2023 Q1 (PANSTARRS):2024 Dec. 27.81 UT: m1=11.6, Dia.=6',?
> DC=1/, 20
>? > >
>? > > cm SCT (77x).[ From dark mountain skies the comet appears visually?
> much
>? > >
>? > > brighter than expected, showing a faint, large and very diffuse?
> outer
>? > >
>? > > coma. Nearby field stars checked in DSS. Limiting star magnitude?
> near
>? > >
>? > > comet : 14.2 (AQ).].( Cubiellos - Sierra del Aramo, 1510 m,?
> Asturias,
>? > >
>? > > Spain ). All the best from the Cantabrian Mountains,J. J. Gonzalez
>? > >
>? > >
>? > >?
> Suarez--------------------------------------------------------------------------------------------------------------------------
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? On Fri, Dec 27, 2024 at 5:28?PM Shanklin, Jonathan D. via?
>
>? > >
>? > > <jdsh=[email protected]> wrote:
>? > >
>? > >? ? ? ? ? My entry for the comet for The Astronomer magazine?
> covering
>? > >
>? > > observations to the end of November and giving the behaviour for
>? > >
>? > > November was:
>? > >
>? > >? ? 2023 Q1 (PANSTARRS) observations cover: -144 to -16 days, 2.6 –?
> 3.0
>? > >
>? > > au
>? > >
>? > >? ? At 17.5, steady (Carson, Pappa)
>? > >
>? > >
>? > >
>? > >? ? Which does suggest that the brightness seen in December is
>? > >
>? > > unexpected.
>? > >
>? > >
>? > >
>? > >? ? I won’t start putting the TA column for the next issue together?
> until
>? > >
>? > > around January 4.
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? Regards,
>? > >
>? > >
>? > >
>? > >? ? Jonathan Shanklin
>? > >
>? > >? ? BAA Comet Section visual observations co-ordinator
>? > >
>? > >? ?
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? From: [email protected] <[email protected]> On Behalf Of?
> Peter
>? > >
>? > > Carson via Sent: Friday, December 27, 2024 3:37 PM To:
>? > >
>? > > [email protected] Subject: [comets-ml] Unusual brightening of?
> comet
>? > >
>? > > C/2023 Q1
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? ? You don't often get email from
>? > >
>? > > petercarson100=[email protected]. Learn why this is important
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? Hello Thomas,
>? > >
>? > >
>? > >
>? > >? ? Here are my observations from summer to now. Unfortunately, I?
> made
>? > >
>? > > no observations in October and early November, so although the?
> comet has
>? > >
>? > > brightened, it is not? clear if the brightening occurred over a?
> short or
>? > >
>? > > long period.
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? All the best
>? > >
>? > >
>? > >
>? > >? ? Peter
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? Type Comet Obs? ? ? ? ? ? ? ? ? ? ? ? date Meth
>? > >
>? > > Mag Refcat Inst T App Inst F Inst P Coma User Location
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 22/12/2024
>? > >
>? > > 21:11 Z 15.6 GG C 31.5 8 1260 0.80' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 10/12/2024
>? > >
>? > > 03:18 Z 15.9 GG C 31.5 8 1200 0.80' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 27/11/2024
>? > >
>? > > 02:43 Z 16.1 GG C 31.5 8 1200 0.80' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 04/09/2024
>? > >
>? > > 01:48 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 16/08/2024
>? > >
>? > > 03:21 Z 17.1 GG C 31.5 8 960 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 05/08/2024
>? > >
>? > > 02:33 Z 17.4 GG C 31.5 8 960 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 16/07/2024
>? > >
>? > > 02:52 Z 17.5 GG C 31.5 8 1080 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 10/07/2024
>? > >
>? > > 02:39 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? From: [email protected] <[email protected]> on behalf of?
> Thomas
>? > >
>? > > Lehmann via <t.lehmann=[email protected]> Sent: 26
>? > >
>? > > December 2024 22:19 To: [email protected] <[email protected]>
>? > >
>? > > Subject: [comets-ml] Unusual brightening of comet C/2023 Q1
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? According to observations by S. Fritsche and myself the?
> comet
>? > >
>? > > C/2023 Q1 has started a sudden brightening in November.?
> Unfortunately
>? > >
>? > > our observations are very sparse due to the bad weather during the?
> last
>? > >
>? > > two months. Our data suggest a brightening by 1-2 mag between?
> October
>? > >
>? > > 26th and November 30th.? Latest measurement (green channel):
>? > >
>? > > 2024-12-23.46 UT, m1=14.1, coma diam. 5'? A more thorough?
> investigation
>? > >
>? > > by using small aperture measurements is on the way.? Thanks to?
> all
>? > >
>? > > contributors for sharing results and ideas/thoughts to this list.?
> Merry
>? > >
>? > > Christmas and best wishes to all of you, Thomas
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? This email and any attachments are intended solely for the?
> use of
>? > >
>? > > the named recipients. If you are not the intended recipient you?
> must not
>? > >
>? > > use, disclose, copy or distribute this email or any of its?
> attachments
>? > >
>? > > and should notify the sender immediately and delete? this email?
> from
>? > >
>? > > your system. UK Research and Innovation (UKRI) has taken every
>? > >
>? > > reasonable precaution to minimise risk of this email or any?
> attachments
>? > >
>? > > containing viruses or malware but the recipient should carry out?
> its own
>? > >
>? > > virus and malware checks before? opening the attachments. UKRI?
> does not
>? > >
>? > > accept any liability for any losses or damages which the recipient?
> may
>? > >
>? > > sustain due to presence of any viruses.
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >?
>? >
>? >
>? >
>? >
>? >?
>
>
>?
>
>
>
>
>
>
>
>
>
>

Dear All,

?

For the moment i measure magnitude 16 using SDSS r' filter. Uncalibrated images. PhotAp 6.1arcsec

?

---

From: [email protected] <[email protected]> on behalf of David Moore(Ireland) via <davefriend0=[email protected]>
Sent: Saturday, December 28, 2024 2:19 PM
To: [email protected] <[email protected]>
Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1

?

Skyglow?

?

If coma diameter is 4' that's 45,000 sq "

I think I saw a figure of 21mag per sq arcsec?

So airglow alone would 'add' 11.6mag i.e. a patch of dark sky 4' in diameter is mag9.4?

?

Is my maths wrong!?

?

?

On Saturday 28 December 2024 at 12:05:34 GMT, Thomas Lehmann via <t.lehmann=[email protected]> wrote:

?

?

Hi Denis,

here is a heavily processed image. Pretty ugly though, but it might serve for
illustration purposes.

Something I'd add to my "total" coma mesurement within 5': the brighness
measurement (statistical) uncertainty is about 0.15mag.

Best wishes
Thomas


> Am Sat, 28 Dec 2024 11:43:28 +0000 (GMT)
> schrieb "Denis Buczynski via " <buczynski8166=[email protected]>:
>
> Hi Thomas,
> I appreciate all you say in this regard.
> I would be more convinced that there was an extensive coma present if I
> could see an image showing this coma. Whether it be from fast f/2
> telescopes in excellent dark skies or from anywhere else . It only
> requires someone posting a current image showing an extensive coma to
> put this "debate " to rest.We have yet to see one.
> Best wishes
> Denis Buczynski
>
>
>? ? ? ? ------ Original Message ------
>? ? ? ? From: t.lehmann=[email protected]
>? ? ? ? To: jjgsgp=[email protected]
> Cc: [email protected]
>? ? ? ? Sent: Saturday, December 28th 2024, 11:17
>? ? ? ? Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1
>
>
>
>? Dear all,
>
>? thanks for the numerous observation reports, especially to Denis's and
> Peter's
>? measurements over longer time span.
>
>? I'd like to emphasize that any brightness measurement MUST be read in
>? conjunction to the measurement aperture used. The aperture diameter
> MUST be
>? taken into account when comparing data. The second important parameter
> is
>? the spectral range covered. The brightening from gaseous outbursts can
> be
>? more prominent in the green filtered images than in unfiltered (or
> red) images.
>
>? About visual estimates.
>? My report of 2024-12-23.46 UT, m1=14.1, coma diam. 5'
>? is derived from images using a fast f/2.2 scope under excellent skies
> having
>? a limited stellar magnitude of 21mag and using heavy smoothing and
> contrast
>? enhancement. I would be very much surprised if it would be possible to
> detect
>? the same amount of coma size visually. It is even harder for me to
> accept that
>? I have missed 90% of the comets coma flux in my measurement - which
> would be
>? the case if the magnitude were near ~11.6mag - though I cannot rule
> out some
>? additional outburst has happened recently.
>
>? Anyway, I'd like to encourage anyone to continue monitoring the comet.
>? For those doing imaging, it would be nice if you could measure the
> coma
>? additionally using a true aperture diameter of d=15000km and 30000km
> at the
>? comet (and report filter information) so we would be able to construct
> a
>? combined light curve of the inner coma brightness.
>
>? Thanks
>? Thomas
>
>
>? > Am Sat, 28 Dec 2024 07:54:29 +0100
>? > schrieb "jjgonzalez jjgonzalez via "?
> <jjgsgp=[email protected]>:
>? >
>? > Thomas, Denis, Alan, all,
>? >
>? > Obviously, I am also interested in the confirmation of the large and?
> very
>? > diffuse gas coma by visual observers from dark skies.
>? >
>? > Best regards,
>? >
>? > J. J. Gonzalez Suarez
>? >
>? > P.S.:
>? >
>? > As complementary information, this is the report of my recent?
> observation
>? > of the large dust coma of 29P :
>? >
>? > 29P/Schwassmann-Wachmann:
>? > 2024 Dec. 27.00 UT: m1=11.1, Dia.=4', DC=2/, 20 cm SCT (77x).
>? > ( Cubiellos - Sierra del Aramo, 1510 m, Asturias, Spain )
>? >
>? >?
> -----------------------------------------------------------------------------------------------------------
>? >
>? >
>? > On Sat, Dec 28, 2024 at 5:39?AM Alan Hale via
> [email protected]> wrote:
>? >?
>? > > Dear Denis, all,
>? > >
>? > >
>? > >
>? > > I’m attaching an image I took of C/2023 Q1 via LCO-Tenerife on?
> December
>? > > 26.97 UT (0.35-m Cassegrain, single 180-second image, unprocessed,
>? > > uncropped (dimensions 30x30 arcmin)). I’ve had some trouble?
> getting
>? > > measurements from the image (possible software issues), but would
>? > > “guesstimate” the magnitude to be somewhere around 15-15.5. I had?
> not
>? > > imaged the comet previously so I can’t comment about any recent?
> brightening.
>? > >
>? > >
>? > >
>? > > For comparison, I’m also attaching an image I took of 29P on?
> December
>? > > 25.60 UT from LCO-Haleakala (0.35-m Cassegrain, single 150-second?
> image,
>? > > also unprocessed and uncropped, 30x30 arcmin). About eight hours?
> before I
>? > > took this image I observed the comet visually at m1 = 11.7, 5.5’?
> coma, DC
>? > > ~1 (41 cm reflector, 70x).
>? > >
>? > >
>? > >
>? > >
>? > >
>? > > Sincerely,
>? > >
>? > > Alan
>? > >
>? > >
>? > >
>? > > Hello all,
>? > >
>? > > I must admit I am a little baffled by these reports of a?
> substantial
>? > >
>? > > increase in brightness of C/2023 Q1.
>? > >
>? > > Firstly Thomas? Lehmann reported an increase in the brightness of?
> this
>? > >
>? > > comet in November to mag 14.1 My observations made for astrometry?
> for
>? > >
>? > > the months of November and December (10 nights data) show the?
> comet only
>? > >
>? > > increasing from mag 17 to mag 16.
>? > >
>? > > This is borne out by Peter Carson and Francois Kugel's comments of?
> their
>? > >
>? > > own observations and measurements.
>? > >
>? > > Now JJ Gonzalez is reporting an observation on the night of Dec 27?
> of
>? > >
>? > > this comet with a magnitude of 11.6.
>? > >
>? > > My last observation was a day or so earlier on Dec 25 and my?
> Comphot
>? > >
>? > > measurement gives a magnitude of 15.73 with a coma diameter of 34?
> arc
>? > >
>? > > secs.
>? > >
>? > > I attach my image.
>? > >
>? > >? Can someone confirm the apparent +4 mag increase in brightness?
> or of
>? > >
>? > > mine, Peter Carson's and Francois Kugel's observation results?
>? > >
>? > >
>? > >
>? > > Comets eh!
>? > >
>? > >? Happy NY
>? > >
>? > > Denis Buczynski
>? > >
>? > > BAA Comet Section
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? ? ------ Original Message ------
>? > >
>? > >? ? ? ? From: jjgsgp=[email protected]
>? > >
>? > >? ? ? ? To: [email protected]
>? > >
>? > >? ? ? ? Sent: Friday, December 27th 2024, 23:52
>? > >
>? > >? ? ? ? Subject: Re: [comets-ml] Unusual brightening of comet?
> C/2023 Q1
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? Thomas, all,After reading your email sent to the list yesterday,?
> I
>? > >
>? > > have arranged an observing session for tonight. This is the report
>? > >
>? > > :C/2023 Q1 (PANSTARRS):2024 Dec. 27.81 UT: m1=11.6, Dia.=6',?
> DC=1/, 20
>? > >
>? > > cm SCT (77x).[ From dark mountain skies the comet appears visually?
> much
>? > >
>? > > brighter than expected, showing a faint, large and very diffuse?
> outer
>? > >
>? > > coma. Nearby field stars checked in DSS. Limiting star magnitude?
> near
>? > >
>? > > comet : 14.2 (AQ).].( Cubiellos - Sierra del Aramo, 1510 m,?
> Asturias,
>? > >
>? > > Spain ). All the best from the Cantabrian Mountains,J. J. Gonzalez
>? > >
>? > >
>? > >?
> Suarez--------------------------------------------------------------------------------------------------------------------------
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? On Fri, Dec 27, 2024 at 5:28?PM Shanklin, Jonathan D. via?
>
>? > >
>? > > <jdsh=[email protected]> wrote:
>? > >
>? > >? ? ? ? ? My entry for the comet for The Astronomer magazine?
> covering
>? > >
>? > > observations to the end of November and giving the behaviour for
>? > >
>? > > November was:
>? > >
>? > >? ? 2023 Q1 (PANSTARRS) observations cover: -144 to -16 days, 2.6 –?
> 3.0
>? > >
>? > > au
>? > >
>? > >? ? At 17.5, steady (Carson, Pappa)
>? > >
>? > >
>? > >
>? > >? ? Which does suggest that the brightness seen in December is
>? > >
>? > > unexpected.
>? > >
>? > >
>? > >
>? > >? ? I won’t start putting the TA column for the next issue together?
> until
>? > >
>? > > around January 4.
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? Regards,
>? > >
>? > >
>? > >
>? > >? ? Jonathan Shanklin
>? > >
>? > >? ? BAA Comet Section visual observations co-ordinator
>? > >
>? > >? ?
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? From: [email protected] <[email protected]> On Behalf Of?
> Peter
>? > >
>? > > Carson via Sent: Friday, December 27, 2024 3:37 PM To:
>? > >
>? > > [email protected] Subject: [comets-ml] Unusual brightening of?
> comet
>? > >
>? > > C/2023 Q1
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? ? You don't often get email from
>? > >
>? > > petercarson100=[email protected]. Learn why this is important
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? Hello Thomas,
>? > >
>? > >
>? > >
>? > >? ? Here are my observations from summer to now. Unfortunately, I?
> made
>? > >
>? > > no observations in October and early November, so although the?
> comet has
>? > >
>? > > brightened, it is not? clear if the brightening occurred over a?
> short or
>? > >
>? > > long period.
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? All the best
>? > >
>? > >
>? > >
>? > >? ? Peter
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? Type Comet Obs? ? ? ? ? ? ? ? ? ? ? ? date Meth
>? > >
>? > > Mag Refcat Inst T App Inst F Inst P Coma User Location
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 22/12/2024
>? > >
>? > > 21:11 Z 15.6 GG C 31.5 8 1260 0.80' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 10/12/2024
>? > >
>? > > 03:18 Z 15.9 GG C 31.5 8 1200 0.80' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 27/11/2024
>? > >
>? > > 02:43 Z 16.1 GG C 31.5 8 1200 0.80' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 04/09/2024
>? > >
>? > > 01:48 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 16/08/2024
>? > >
>? > > 03:21 Z 17.1 GG C 31.5 8 960 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 05/08/2024
>? > >
>? > > 02:33 Z 17.4 GG C 31.5 8 960 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 16/07/2024
>? > >
>? > > 02:52 Z 17.5 GG C 31.5 8 1080 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 10/07/2024
>? > >
>? > > 02:39 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? From: [email protected] <[email protected]> on behalf of?
> Thomas
>? > >
>? > > Lehmann via <t.lehmann=[email protected]> Sent: 26
>? > >
>? > > December 2024 22:19 To: [email protected] <[email protected]>
>? > >
>? > > Subject: [comets-ml] Unusual brightening of comet C/2023 Q1
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? According to observations by S. Fritsche and myself the?
> comet
>? > >
>? > > C/2023 Q1 has started a sudden brightening in November.?
> Unfortunately
>? > >
>? > > our observations are very sparse due to the bad weather during the?
> last
>? > >
>? > > two months. Our data suggest a brightening by 1-2 mag between?
> October
>? > >
>? > > 26th and November 30th.? Latest measurement (green channel):
>? > >
>? > > 2024-12-23.46 UT, m1=14.1, coma diam. 5'? A more thorough?
> investigation
>? > >
>? > > by using small aperture measurements is on the way.? Thanks to?
> all
>? > >
>? > > contributors for sharing results and ideas/thoughts to this list.?
> Merry
>? > >
>? > > Christmas and best wishes to all of you, Thomas
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? This email and any attachments are intended solely for the?
> use of
>? > >
>? > > the named recipients. If you are not the intended recipient you?
> must not
>? > >
>? > > use, disclose, copy or distribute this email or any of its?
> attachments
>? > >
>? > > and should notify the sender immediately and delete? this email?
> from
>? > >
>? > > your system. UK Research and Innovation (UKRI) has taken every
>? > >
>? > > reasonable precaution to minimise risk of this email or any?
> attachments
>? > >
>? > > containing viruses or malware but the recipient should carry out?
> its own
>? > >
>? > > virus and malware checks before? opening the attachments. UKRI?
> does not
>? > >
>? > > accept any liability for any losses or damages which the recipient?
> may
>? > >
>? > > sustain due to presence of any viruses.
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >?
>? >
>? >
>? >
>? >
>? >?
>
>
>?
>
>
>
>
>
>
>
>
>
>

Dear All,

For the moment i measure magnitude 16 using SDSS r' filter. Uncalibrated images. PhotAp 6.1arcsec

---

From: [email protected] <[email protected]> on behalf of David Moore(Ireland) via <davefriend0=[email protected]>
Sent: Saturday, December 28, 2024 2:19 PM
To: [email protected] <[email protected]>
Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1

?

Skyglow?

If coma diameter is 4' that's 45,000 sq "

I think I saw a figure of 21mag per sq arcsec?

So airglow alone would 'add' 11.6mag i.e. a patch of dark sky 4' in diameter is mag9.4?

Is my maths wrong!?

On Saturday 28 December 2024 at 12:05:34 GMT, Thomas Lehmann via <t.lehmann=[email protected]> wrote:

Hi Denis,

here is a heavily processed image. Pretty ugly though, but it might serve for
illustration purposes.

Something I'd add to my "total" coma mesurement within 5': the brighness
measurement (statistical) uncertainty is about 0.15mag.

Best wishes
Thomas


> Am Sat, 28 Dec 2024 11:43:28 +0000 (GMT)
> schrieb "Denis Buczynski via " <buczynski8166=[email protected]>:
>
> Hi Thomas,
> I appreciate all you say in this regard.
> I would be more convinced that there was an extensive coma present if I
> could see an image showing this coma. Whether it be from fast f/2
> telescopes in excellent dark skies or from anywhere else . It only
> requires someone posting a current image showing an extensive coma to
> put this "debate " to rest.We have yet to see one.
> Best wishes
> Denis Buczynski
>
>
>? ? ? ? ------ Original Message ------
>? ? ? ? From: t.lehmann=[email protected]
>? ? ? ? To: jjgsgp=[email protected]
> Cc: [email protected]
>? ? ? ? Sent: Saturday, December 28th 2024, 11:17
>? ? ? ? Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1
>
>
>
>? Dear all,
>
>? thanks for the numerous observation reports, especially to Denis's and
> Peter's
>? measurements over longer time span.
>
>? I'd like to emphasize that any brightness measurement MUST be read in
>? conjunction to the measurement aperture used. The aperture diameter
> MUST be
>? taken into account when comparing data. The second important parameter
> is
>? the spectral range covered. The brightening from gaseous outbursts can
> be
>? more prominent in the green filtered images than in unfiltered (or
> red) images.
>
>? About visual estimates.
>? My report of 2024-12-23.46 UT, m1=14.1, coma diam. 5'
>? is derived from images using a fast f/2.2 scope under excellent skies
> having
>? a limited stellar magnitude of 21mag and using heavy smoothing and
> contrast
>? enhancement. I would be very much surprised if it would be possible to
> detect
>? the same amount of coma size visually. It is even harder for me to
> accept that
>? I have missed 90% of the comets coma flux in my measurement - which
> would be
>? the case if the magnitude were near ~11.6mag - though I cannot rule
> out some
>? additional outburst has happened recently.
>
>? Anyway, I'd like to encourage anyone to continue monitoring the comet.
>? For those doing imaging, it would be nice if you could measure the
> coma
>? additionally using a true aperture diameter of d=15000km and 30000km
> at the
>? comet (and report filter information) so we would be able to construct
> a
>? combined light curve of the inner coma brightness.
>
>? Thanks
>? Thomas
>
>
>? > Am Sat, 28 Dec 2024 07:54:29 +0100
>? > schrieb "jjgonzalez jjgonzalez via "?
> <jjgsgp=[email protected]>:
>? >
>? > Thomas, Denis, Alan, all,
>? >
>? > Obviously, I am also interested in the confirmation of the large and?
> very
>? > diffuse gas coma by visual observers from dark skies.
>? >
>? > Best regards,
>? >
>? > J. J. Gonzalez Suarez
>? >
>? > P.S.:
>? >
>? > As complementary information, this is the report of my recent?
> observation
>? > of the large dust coma of 29P :
>? >
>? > 29P/Schwassmann-Wachmann:
>? > 2024 Dec. 27.00 UT: m1=11.1, Dia.=4', DC=2/, 20 cm SCT (77x).
>? > ( Cubiellos - Sierra del Aramo, 1510 m, Asturias, Spain )
>? >
>? >?
> -----------------------------------------------------------------------------------------------------------
>? >
>? >
>? > On Sat, Dec 28, 2024 at 5:39?AM Alan Hale via
> [email protected]> wrote:
>? >?
>? > > Dear Denis, all,
>? > >
>? > >
>? > >
>? > > I’m attaching an image I took of C/2023 Q1 via LCO-Tenerife on?
> December
>? > > 26.97 UT (0.35-m Cassegrain, single 180-second image, unprocessed,
>? > > uncropped (dimensions 30x30 arcmin)). I’ve had some trouble?
> getting
>? > > measurements from the image (possible software issues), but would
>? > > “guesstimate” the magnitude to be somewhere around 15-15.5. I had?
> not
>? > > imaged the comet previously so I can’t comment about any recent?
> brightening.
>? > >
>? > >
>? > >
>? > > For comparison, I’m also attaching an image I took of 29P on?
> December
>? > > 25.60 UT from LCO-Haleakala (0.35-m Cassegrain, single 150-second?
> image,
>? > > also unprocessed and uncropped, 30x30 arcmin). About eight hours?
> before I
>? > > took this image I observed the comet visually at m1 = 11.7, 5.5’?
> coma, DC
>? > > ~1 (41 cm reflector, 70x).
>? > >
>? > >
>? > >
>? > >
>? > >
>? > > Sincerely,
>? > >
>? > > Alan
>? > >
>? > >
>? > >
>? > > Hello all,
>? > >
>? > > I must admit I am a little baffled by these reports of a?
> substantial
>? > >
>? > > increase in brightness of C/2023 Q1.
>? > >
>? > > Firstly Thomas? Lehmann reported an increase in the brightness of?
> this
>? > >
>? > > comet in November to mag 14.1 My observations made for astrometry?
> for
>? > >
>? > > the months of November and December (10 nights data) show the?
> comet only
>? > >
>? > > increasing from mag 17 to mag 16.
>? > >
>? > > This is borne out by Peter Carson and Francois Kugel's comments of?
> their
>? > >
>? > > own observations and measurements.
>? > >
>? > > Now JJ Gonzalez is reporting an observation on the night of Dec 27?
> of
>? > >
>? > > this comet with a magnitude of 11.6.
>? > >
>? > > My last observation was a day or so earlier on Dec 25 and my?
> Comphot
>? > >
>? > > measurement gives a magnitude of 15.73 with a coma diameter of 34?
> arc
>? > >
>? > > secs.
>? > >
>? > > I attach my image.
>? > >
>? > >? Can someone confirm the apparent +4 mag increase in brightness?
> or of
>? > >
>? > > mine, Peter Carson's and Francois Kugel's observation results?
>? > >
>? > >
>? > >
>? > > Comets eh!
>? > >
>? > >? Happy NY
>? > >
>? > > Denis Buczynski
>? > >
>? > > BAA Comet Section
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? ? ------ Original Message ------
>? > >
>? > >? ? ? ? From: jjgsgp=[email protected]
>? > >
>? > >? ? ? ? To: [email protected]
>? > >
>? > >? ? ? ? Sent: Friday, December 27th 2024, 23:52
>? > >
>? > >? ? ? ? Subject: Re: [comets-ml] Unusual brightening of comet?
> C/2023 Q1
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? Thomas, all,After reading your email sent to the list yesterday,?
> I
>? > >
>? > > have arranged an observing session for tonight. This is the report
>? > >
>? > > :C/2023 Q1 (PANSTARRS):2024 Dec. 27.81 UT: m1=11.6, Dia.=6',?
> DC=1/, 20
>? > >
>? > > cm SCT (77x).[ From dark mountain skies the comet appears visually?
> much
>? > >
>? > > brighter than expected, showing a faint, large and very diffuse?
> outer
>? > >
>? > > coma. Nearby field stars checked in DSS. Limiting star magnitude?
> near
>? > >
>? > > comet : 14.2 (AQ).].( Cubiellos - Sierra del Aramo, 1510 m,?
> Asturias,
>? > >
>? > > Spain ). All the best from the Cantabrian Mountains,J. J. Gonzalez
>? > >
>? > >
>? > >?
> Suarez--------------------------------------------------------------------------------------------------------------------------
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? On Fri, Dec 27, 2024 at 5:28?PM Shanklin, Jonathan D. via?
>
>? > >
>? > > <jdsh=[email protected]> wrote:
>? > >
>? > >? ? ? ? ? My entry for the comet for The Astronomer magazine?
> covering
>? > >
>? > > observations to the end of November and giving the behaviour for
>? > >
>? > > November was:
>? > >
>? > >? ? 2023 Q1 (PANSTARRS) observations cover: -144 to -16 days, 2.6 –?
> 3.0
>? > >
>? > > au
>? > >
>? > >? ? At 17.5, steady (Carson, Pappa)
>? > >
>? > >
>? > >
>? > >? ? Which does suggest that the brightness seen in December is
>? > >
>? > > unexpected.
>? > >
>? > >
>? > >
>? > >? ? I won’t start putting the TA column for the next issue together?
> until
>? > >
>? > > around January 4.
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? Regards,
>? > >
>? > >
>? > >
>? > >? ? Jonathan Shanklin
>? > >
>? > >? ? BAA Comet Section visual observations co-ordinator
>? > >
>? > >? ?
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? From: [email protected] <[email protected]> On Behalf Of?
> Peter
>? > >
>? > > Carson via Sent: Friday, December 27, 2024 3:37 PM To:
>? > >
>? > > [email protected] Subject: [comets-ml] Unusual brightening of?
> comet
>? > >
>? > > C/2023 Q1
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? ? You don't often get email from
>? > >
>? > > petercarson100=[email protected]. Learn why this is important
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? Hello Thomas,
>? > >
>? > >
>? > >
>? > >? ? Here are my observations from summer to now. Unfortunately, I?
> made
>? > >
>? > > no observations in October and early November, so although the?
> comet has
>? > >
>? > > brightened, it is not? clear if the brightening occurred over a?
> short or
>? > >
>? > > long period.
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? All the best
>? > >
>? > >
>? > >
>? > >? ? Peter
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? Type Comet Obs? ? ? ? ? ? ? ? ? ? ? ? date Meth
>? > >
>? > > Mag Refcat Inst T App Inst F Inst P Coma User Location
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 22/12/2024
>? > >
>? > > 21:11 Z 15.6 GG C 31.5 8 1260 0.80' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 10/12/2024
>? > >
>? > > 03:18 Z 15.9 GG C 31.5 8 1200 0.80' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 27/11/2024
>? > >
>? > > 02:43 Z 16.1 GG C 31.5 8 1200 0.80' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 04/09/2024
>? > >
>? > > 01:48 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 16/08/2024
>? > >
>? > > 03:21 Z 17.1 GG C 31.5 8 960 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 05/08/2024
>? > >
>? > > 02:33 Z 17.4 GG C 31.5 8 960 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 16/07/2024
>? > >
>? > > 02:52 Z 17.5 GG C 31.5 8 1080 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >? ? CCD C/2023 Q1 10/07/2024
>? > >
>? > > 02:39 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
>? > >
>? > > Observatory Z10, Fregenal de la sierra, Spain
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? From: [email protected] <[email protected]> on behalf of?
> Thomas
>? > >
>? > > Lehmann via <t.lehmann=[email protected]> Sent: 26
>? > >
>? > > December 2024 22:19 To: [email protected] <[email protected]>
>? > >
>? > > Subject: [comets-ml] Unusual brightening of comet C/2023 Q1
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? According to observations by S. Fritsche and myself the?
> comet
>? > >
>? > > C/2023 Q1 has started a sudden brightening in November.?
> Unfortunately
>? > >
>? > > our observations are very sparse due to the bad weather during the?
> last
>? > >
>? > > two months. Our data suggest a brightening by 1-2 mag between?
> October
>? > >
>? > > 26th and November 30th.? Latest measurement (green channel):
>? > >
>? > > 2024-12-23.46 UT, m1=14.1, coma diam. 5'? A more thorough?
> investigation
>? > >
>? > > by using small aperture measurements is on the way.? Thanks to?
> all
>? > >
>? > > contributors for sharing results and ideas/thoughts to this list.?
> Merry
>? > >
>? > > Christmas and best wishes to all of you, Thomas
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >? ? ? This email and any attachments are intended solely for the?
> use of
>? > >
>? > > the named recipients. If you are not the intended recipient you?
> must not
>? > >
>? > > use, disclose, copy or distribute this email or any of its?
> attachments
>? > >
>? > > and should notify the sender immediately and delete? this email?
> from
>? > >
>? > > your system. UK Research and Innovation (UKRI) has taken every
>? > >
>? > > reasonable precaution to minimise risk of this email or any?
> attachments
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>? > > containing viruses or malware but the recipient should carry out?
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>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >
>? > >?
>? >
>? >
>? >
>? >
>? >?
>
>
>?
>
>
>
>
>
>
>
>
>
>

Hi again Thomas,
Thanks for posting this image. I agree it does show an extended 
coma.When was this taken and with what instumentation? As you say 
heavily processed, would such faint feature be visible to an observer at 
a dark sky site. I know that there are obsevers who can see vaery faint 
features that others cannot. I remember Brian Marsden commenting that 
George Alcock was able to see very faint comet comas and tail 
details(real) that were not seen by others.
  Comet observing is so heavily influenced by observing conditons, 
whether it be imaging or visually.
Why do you think we are seeing this extensive coma, there has been no 
outburst of the central condensation. When 12p had central condensation 
outbursts there seemed to be no substantial increase in the total 
integrated magnitude. With this comet, are we seeing an increase in the 
total integrated magnitude without any outburst of the central 
condensation? How are we seeing material being released from the central 
condensation into the coma to increase its brightness and overall size 
without any sign of increased activity from the central condensation. 
With 29p we see outbursts measured using small apertures which then 
produce material to populate the coma and make it larger and brighter 
and expanding.
Perhaps we can hear from some of the comet scientists in anwering these 
questions.
As I said comets eh!
Best wishes
Denis


        ------ Original Message ------
        From: [email protected]
        To: [email protected]
        Sent: Saturday, December 28th 2024, 12:05
        Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1



  Hi Denis,

  here is a heavily processed image. Pretty ugly though, but it might 
serve for
  illustration purposes.

  Something I'd add to my "total" coma mesurement within 5': the 
brighness
  measurement (statistical) uncertainty is about 0.15mag.

  Best wishes
  Thomas


 Am Sat, 28 Dec 2024 11:43:28 +0000 (GMT)
 schrieb "Denis Buczynski via " :

 Hi Thomas,
 I appreciate all you say in this regard.
 I would be more convinced that there was an extensive coma present 
if I
 could see an image showing this coma. Whether it be from fast f/2
 telescopes in excellent dark skies or from anywhere else . It only
 requires someone posting a current image showing an extensive coma 
to
 put this "debate " to rest.We have yet to see one.
 Best wishes
 Denis Buczynski


         ------ Original Message ------
         From: [email protected]
         To: [email protected]
 Cc: [email protected]
         Sent: Saturday, December 28th 2024, 11:17
         Subject: Re: [comets-ml] Unusual brightening of comet C/2023 
Q1



   Dear all,

   thanks for the numerous observation reports, especially to Denis's 
and
 Peter's
   measurements over longer time span.

   I'd like to emphasize that any brightness measurement MUST be read 
in
   conjunction to the measurement aperture used. The aperture 
diameter
 MUST be
   taken into account when comparing data. The second important 
parameter
 is
   the spectral range covered. The brightening from gaseous outbursts 
can
 be
   more prominent in the green filtered images than in unfiltered (or
 red) images.

   About visual estimates.
   My report of 2024-12-23.46 UT, m1=14.1, coma diam. 5'
   is derived from images using a fast f/2.2 scope under excellent 
skies
 having
   a limited stellar magnitude of 21mag and using heavy smoothing and
 contrast
   enhancement. I would be very much surprised if it would be 
possible to
 detect
   the same amount of coma size visually. It is even harder for me to
 accept that
   I have missed 90% of the comets coma flux in my measurement - 
which
 would be
   the case if the magnitude were near ~11.6mag - though I cannot 
rule
 out some
   additional outburst has happened recently.

   Anyway, I'd like to encourage anyone to continue monitoring the 
comet.
   For those doing imaging, it would be nice if you could measure the
 coma
   additionally using a true aperture diameter of d=15000km and 
30000km
 at the
   comet (and report filter information) so we would be able to 
construct
 a
   combined light curve of the inner coma brightness.

   Thanks
   Thomas


 Am Sat, 28 Dec 2024 07:54:29 +0100
 schrieb "jjgonzalez jjgonzalez via "
 <[email protected]>:

 Thomas, Denis, Alan, all,

 Obviously, I am also interested in the confirmation of the large 
and
 very
 diffuse gas coma by visual observers from dark skies.

 Best regards,

 J. J. Gonzalez Suarez

 P.S.:

 As complementary information, this is the report of my recent
 observation
 of the large dust coma of 29P :

 29P/Schwassmann-Wachmann:
 2024 Dec. 27.00 UT: m1=11.1, Dia.=4', DC=2/, 20 cm SCT (77x).
 ( Cubiellos - Sierra del Aramo, 1510 m, Asturias, Spain )


 



 On Sat, Dec 28, 2024 at 5:39?AM Alan Hale via 
 @groups.io> wrote:

 Dear Denis, all,



 I’m attaching an image I took of C/2023 Q1 via LCO-Tenerife on
 December
 26.97 UT (0.35-m Cassegrain, single 180-second image, 
unprocessed,
 uncropped (dimensions 30x30 arcmin)). I’ve had some trouble
 getting
 measurements from the image (possible software issues), but 
would
 “guesstimate” the magnitude to be somewhere around 15-15.5. I 
had
 not
 imaged the comet previously so I can’t comment about any 
recent
 brightening.



 For comparison, I’m also attaching an image I took of 29P on
 December
 25.60 UT from LCO-Haleakala (0.35-m Cassegrain, single 
150-second
 image,
 also unprocessed and uncropped, 30x30 arcmin). About eight 
hours
 before I
 took this image I observed the comet visually at m1 = 11.7, 
5.5’
 coma, DC
 ~1 (41 cm reflector, 70x).





 Sincerely,

 Alan



 Hello all,

 I must admit I am a little baffled by these reports of a
 substantial

 increase in brightness of C/2023 Q1.

 Firstly Thomas  Lehmann reported an increase in the brightness 
of
 this

 comet in November to mag 14.1 My observations made for 
astrometry
 for

 the months of November and December (10 nights data) show the
 comet only

 increasing from mag 17 to mag 16.

 This is borne out by Peter Carson and Francois Kugel's 
comments of
 their

 own observations and measurements.

 Now JJ Gonzalez is reporting an observation on the night of 
Dec 27
 of

 this comet with a magnitude of 11.6.

 My last observation was a day or so earlier on Dec 25 and my
 Comphot

 measurement gives a magnitude of 15.73 with a coma diameter of 
34
 arc

 secs.

 I attach my image.

   Can someone confirm the apparent +4 mag increase in 
brightness
 or of

 mine, Peter Carson's and Francois Kugel's observation results?



 Comets eh!

   Happy NY

 Denis Buczynski

 BAA Comet Section







         ------ Original Message ------

         From: [email protected]

         To: [email protected]

         Sent: Friday, December 27th 2024, 23:52

         Subject: Re: [comets-ml] Unusual brightening of comet
 C/2023 Q1





   Thomas, all,After reading your email sent to the list 
yesterday,
 I

 have arranged an observing session for tonight. This is the 
report

 :C/2023 Q1 (PANSTARRS):2024 Dec. 27.81 UT: m1=11.6, Dia.=6',
 DC=1/, 20

 cm SCT (77x).[ From dark mountain skies the comet appears 
visually
 much

 brighter than expected, showing a faint, large and very 
diffuse
 outer

 coma. Nearby field stars checked in DSS. Limiting star 
magnitude
 near

 comet : 14.2 (AQ).].( Cubiellos - Sierra del Aramo, 1510 m,
 Asturias,

 Spain ). All the best from the Cantabrian Mountains,J. J. 
Gonzalez


 
Suarez






   On Fri, Dec 27, 2024 at 5:28?PM Shanklin, Jonathan D. via
 

 <[email protected]> wrote:

           My entry for the comet for The Astronomer magazine
 covering

 observations to the end of November and giving the behaviour 
for

 November was:

    2023 Q1 (PANSTARRS) observations cover: -144 to -16 days, 
2.6 –
 3.0

 au

    At 17.5, steady (Carson, Pappa)



    Which does suggest that the brightness seen in December is

 unexpected.



    I won’t start putting the TA column for the next issue 
together
 until

 around January 4.





    Regards,



    Jonathan Shanklin

    BAA Comet Section visual observations co-ordinator

    /









      From: [email protected] <[email protected]> On Behalf 
Of
 Peter

 Carson via  Sent: Friday, December 27, 2024 3:37 PM 
To:

 [email protected] Subject: [comets-ml] Unusual brightening 
of
 comet

 C/2023 Q1







        You don't often get email from

 [email protected]. Learn why this is 
important







     Hello Thomas,



     Here are my observations from summer to now. 
Unfortunately, I
 made

 no observations in October and early November, so although the
 comet has

 brightened, it is not  clear if the brightening occurred over 
a
 short or

 long period.







     All the best



     Peter







     Type Comet Obs                         date Meth

 Mag Refcat Inst T App Inst F Inst P Coma User Location



     CCD C/2023 Q1 22/12/2024

 21:11 Z 15.6 GG C 31.5 8 1260 0.80' CAR06 PGC

 Observatory Z10, Fregenal de la sierra, Spain



     CCD C/2023 Q1 10/12/2024

 03:18 Z 15.9 GG C 31.5 8 1200 0.80' CAR06 PGC

 Observatory Z10, Fregenal de la sierra, Spain



     CCD C/2023 Q1 27/11/2024

 02:43 Z 16.1 GG C 31.5 8 1200 0.80' CAR06 PGC

 Observatory Z10, Fregenal de la sierra, Spain



     CCD C/2023 Q1 04/09/2024

 01:48 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC

 Observatory Z10, Fregenal de la sierra, Spain



     CCD C/2023 Q1 16/08/2024

 03:21 Z 17.1 GG C 31.5 8 960 0.40' CAR06 PGC

 Observatory Z10, Fregenal de la sierra, Spain



     CCD C/2023 Q1 05/08/2024

 02:33 Z 17.4 GG C 31.5 8 960 0.40' CAR06 PGC

 Observatory Z10, Fregenal de la sierra, Spain



     CCD C/2023 Q1 16/07/2024

 02:52 Z 17.5 GG C 31.5 8 1080 0.40' CAR06 PGC

 Observatory Z10, Fregenal de la sierra, Spain



     CCD C/2023 Q1 10/07/2024

 02:39 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC

 Observatory Z10, Fregenal de la sierra, Spain

















     From: [email protected] <[email protected]> on behalf 
of
 Thomas

 Lehmann via  <[email protected]> Sent: 
26

 December 2024 22:19 To: [email protected] 
<[email protected]>

 Subject: [comets-ml] Unusual brightening of comet C/2023 Q1







       According to observations by S. Fritsche and myself the
 comet

 C/2023 Q1 has started a sudden brightening in November.
 Unfortunately

 our observations are very sparse due to the bad weather during 
the
 last

 two months. Our data suggest a brightening by 1-2 mag between
 October

 26th and November 30th.  Latest measurement (green channel):

 2024-12-23.46 UT, m1=14.1, coma diam. 5'  A more thorough
 investigation

 by using small aperture measurements is on the way.   Thanks 
to
 all

 contributors for sharing results and ideas/thoughts to this 
list.
 Merry

 Christmas and best wishes to all of you, Thomas













      This email and any attachments are intended solely for 
the
 use of

 the named recipients. If you are not the intended recipient 
you
 must not

 use, disclose, copy or distribute this email or any of its
 attachments

 and should notify the sender immediately and delete  this 
email
 from

 your system. UK Research and Innovation (UKRI) has taken every

 reasonable precaution to minimise risk of this email or any
 attachments

 containing viruses or malware but the recipient should carry 
out
 its own

 virus and malware checks before  opening the attachments. UKRI
 does not

 accept any liability for any losses or damages which the 
recipient
 may

 sustain due to presence of any viruses.















































  

Am Sat, 28 Dec 2024 13:19:56 +0000 (UTC)
schrieb "David Moore(Ireland) via groups.io" <davefriend0@...>:

Skyglow?
If coma diameter is 4' that's 45,000 sq "I think I saw a figure of 21mag per sq arcsec?So airglow alone would 'add' 11.6mag i.e. a patch of dark sky 4' in diameter is mag9.4?
Is my maths wrong!?

On Saturday 28 December 2024 at 12:05:34 GMT, Thomas Lehmann via groups.io <t.lehmann@...> wrote:


Hi Denis,

here is a heavily processed image. Pretty ugly though, but it might serve for
illustration purposes.

Something I'd add to my "total" coma mesurement within 5': the brighness
measurement (statistical) uncertainty is about 0.15mag.

Best wishes
Thomas

Am Sat, 28 Dec 2024 11:43:28 +0000 (GMT)
schrieb "Denis Buczynski via groups.io" <buczynski8166@...>:

Hi Thomas,
I appreciate all you say in this regard.
I would be more convinced that there was an extensive coma present if I
could see an image showing this coma. Whether it be from fast f/2
telescopes in excellent dark skies or from anywhere else . It only
requires someone posting a current image showing an extensive coma to
put this "debate " to rest.We have yet to see one.
Best wishes
Denis Buczynski


? ? ? ? ------ Original Message ------
? ? ? ? From: t.lehmann@...
? ? ? ? To: jjgsgp@...
Cc: [email protected]
? ? ? ? Sent: Saturday, December 28th 2024, 11:17
? ? ? ? Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1



? Dear all,

? thanks for the numerous observation reports, especially to Denis's and
Peter's
? measurements over longer time span.

? I'd like to emphasize that any brightness measurement MUST be read in
? conjunction to the measurement aperture used. The aperture diameter
MUST be
? taken into account when comparing data. The second important parameter
is
? the spectral range covered. The brightening from gaseous outbursts can
be
? more prominent in the green filtered images than in unfiltered (or
red) images.

? About visual estimates.
? My report of 2024-12-23.46 UT, m1=14.1, coma diam. 5'
? is derived from images using a fast f/2.2 scope under excellent skies
having
? a limited stellar magnitude of 21mag and using heavy smoothing and
contrast
? enhancement. I would be very much surprised if it would be possible to
detect
? the same amount of coma size visually. It is even harder for me to
accept that
? I have missed 90% of the comets coma flux in my measurement - which
would be
? the case if the magnitude were near ~11.6mag - though I cannot rule
out some
? additional outburst has happened recently.

? Anyway, I'd like to encourage anyone to continue monitoring the comet.
? For those doing imaging, it would be nice if you could measure the
coma
? additionally using a true aperture diameter of d=15000km and 30000km
at the
? comet (and report filter information) so we would be able to construct
a
? combined light curve of the inner coma brightness.

? Thanks
? Thomas


? > Am Sat, 28 Dec 2024 07:54:29 +0100
? > schrieb "jjgonzalez jjgonzalez via groups.io"?
<jjgsgp@...>:
? >
? > Thomas, Denis, Alan, all,
? >
? > Obviously, I am also interested in the confirmation of the large and?
very
? > diffuse gas coma by visual observers from dark skies.
? >
? > Best regards,
? >
? > J. J. Gonzalez Suarez
? >
? > P.S.:
? >
? > As complementary information, this is the report of my recent?
observation
? > of the large dust coma of 29P :
? >
? > 29P/Schwassmann-Wachmann:
? > 2024 Dec. 27.00 UT: m1=11.1, Dia.=4', DC=2/, 20 cm SCT (77x).
? > ( Cubiellos - Sierra del Aramo, 1510 m, Asturias, Spain )
? >
? >?
-----------------------------------------------------------------------------------------------------------
? >
? >
? > On Sat, Dec 28, 2024 at 5:39?AM Alan Hale via groups.io
[email protected]> wrote:
? >?
? > > Dear Denis, all,
? > >
? > >
? > >
? > > I’m attaching an image I took of C/2023 Q1 via LCO-Tenerife on?
December
? > > 26.97 UT (0.35-m Cassegrain, single 180-second image, unprocessed,
? > > uncropped (dimensions 30x30 arcmin)). I’ve had some trouble?
getting
? > > measurements from the image (possible software issues), but would
? > > “guesstimate” the magnitude to be somewhere around 15-15.5. I had?
not
? > > imaged the comet previously so I can’t comment about any recent?
brightening.
? > >
? > >
? > >
? > > For comparison, I’m also attaching an image I took of 29P on?
December
? > > 25.60 UT from LCO-Haleakala (0.35-m Cassegrain, single 150-second?
image,
? > > also unprocessed and uncropped, 30x30 arcmin). About eight hours?
before I
? > > took this image I observed the comet visually at m1 = 11.7, 5.5’?
coma, DC
? > > ~1 (41 cm reflector, 70x).
? > >
? > >
? > >
? > >
? > >
? > > Sincerely,
? > >
? > > Alan
? > >
? > >
? > >
? > > Hello all,
? > >
? > > I must admit I am a little baffled by these reports of a?
substantial
? > >
? > > increase in brightness of C/2023 Q1.
? > >
? > > Firstly Thomas? Lehmann reported an increase in the brightness of?
this
? > >
? > > comet in November to mag 14.1 My observations made for astrometry?
for
? > >
? > > the months of November and December (10 nights data) show the?
comet only
? > >
? > > increasing from mag 17 to mag 16.
? > >
? > > This is borne out by Peter Carson and Francois Kugel's comments of?
their
? > >
? > > own observations and measurements.
? > >
? > > Now JJ Gonzalez is reporting an observation on the night of Dec 27?
of
? > >
? > > this comet with a magnitude of 11.6.
? > >
? > > My last observation was a day or so earlier on Dec 25 and my?
Comphot
? > >
? > > measurement gives a magnitude of 15.73 with a coma diameter of 34?
arc
? > >
? > > secs.
? > >
? > > I attach my image.
? > >
? > >? Can someone confirm the apparent +4 mag increase in brightness?
or of
? > >
? > > mine, Peter Carson's and Francois Kugel's observation results?
? > >
? > >
? > >
? > > Comets eh!
? > >
? > >? Happy NY
? > >
? > > Denis Buczynski
? > >
? > > BAA Comet Section
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >? ? ? ? ------ Original Message ------
? > >
? > >? ? ? ? From: jjgsgp@...
? > >
? > >? ? ? ? To: [email protected]
? > >
? > >? ? ? ? Sent: Friday, December 27th 2024, 23:52
? > >
? > >? ? ? ? Subject: Re: [comets-ml] Unusual brightening of comet?
C/2023 Q1
? > >
? > >
? > >
? > >
? > >
? > >? Thomas, all,After reading your email sent to the list yesterday,?
I
? > >
? > > have arranged an observing session for tonight. This is the report
? > >
? > > :C/2023 Q1 (PANSTARRS):2024 Dec. 27.81 UT: m1=11.6, Dia.=6',?
DC=1/, 20
? > >
? > > cm SCT (77x).[ From dark mountain skies the comet appears visually?
much
? > >
? > > brighter than expected, showing a faint, large and very diffuse?
outer
? > >
? > > coma. Nearby field stars checked in DSS. Limiting star magnitude?
near
? > >
? > > comet : 14.2 (AQ).].( Cubiellos - Sierra del Aramo, 1510 m,?
Asturias,
? > >
? > > Spain ). All the best from the Cantabrian Mountains,J. J. Gonzalez
? > >
? > >
? > >?
Suarez--------------------------------------------------------------------------------------------------------------------------
? > >
? > >
? > >
? > >
? > >
? > >? On Fri, Dec 27, 2024 at 5:28?PM Shanklin, Jonathan D. via?
groups.io
? > >
? > > <jdsh@...> wrote:
? > >
? > >? ? ? ? ? My entry for the comet for The Astronomer magazine?
covering
? > >
? > > observations to the end of November and giving the behaviour for
? > >
? > > November was:
? > >
? > >? ? 2023 Q1 (PANSTARRS) observations cover: -144 to -16 days, 2.6 –?
3.0
? > >
? > > au
? > >
? > >? ? At 17.5, steady (Carson, Pappa)
? > >
? > >
? > >
? > >? ? Which does suggest that the brightness seen in December is
? > >
? > > unexpected.
? > >
? > >
? > >
? > >? ? I won’t start putting the TA column for the next issue together?
until
? > >
? > > around January 4.
? > >
? > >
? > >
? > >
? > >
? > >? ? Regards,
? > >
? > >
? > >
? > >? ? Jonathan Shanklin
? > >
? > >? ? BAA Comet Section visual observations co-ordinator
? > >
? > >? ?
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >? ? ? From: [email protected] <[email protected]> On Behalf Of?
Peter
? > >
? > > Carson via groups.io Sent: Friday, December 27, 2024 3:37 PM To:
? > >
? > > [email protected] Subject: [comets-ml] Unusual brightening of?
comet
? > >
? > > C/2023 Q1
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >? ? ? ? You don't often get email from
? > >
? > > petercarson100@.... Learn why this is important
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >? ? Hello Thomas,
? > >
? > >
? > >
? > >? ? Here are my observations from summer to now. Unfortunately, I?
made
? > >
? > > no observations in October and early November, so although the?
comet has
? > >
? > > brightened, it is not? clear if the brightening occurred over a?
short or
? > >
? > > long period.
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >? ? All the best
? > >
? > >
? > >
? > >? ? Peter
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >? ? Type Comet Obs? ? ? ? ? ? ? ? ? ? ? ? date Meth
? > >
? > > Mag Refcat Inst T App Inst F Inst P Coma User Location
? > >
? > >
? > >
? > >? ? CCD C/2023 Q1 22/12/2024
? > >
? > > 21:11 Z 15.6 GG C 31.5 8 1260 0.80' CAR06 PGC
? > >
? > > Observatory Z10, Fregenal de la sierra, Spain
? > >
? > >
? > >
? > >? ? CCD C/2023 Q1 10/12/2024
? > >
? > > 03:18 Z 15.9 GG C 31.5 8 1200 0.80' CAR06 PGC
? > >
? > > Observatory Z10, Fregenal de la sierra, Spain
? > >
? > >
? > >
? > >? ? CCD C/2023 Q1 27/11/2024
? > >
? > > 02:43 Z 16.1 GG C 31.5 8 1200 0.80' CAR06 PGC
? > >
? > > Observatory Z10, Fregenal de la sierra, Spain
? > >
? > >
? > >
? > >? ? CCD C/2023 Q1 04/09/2024
? > >
? > > 01:48 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
? > >
? > > Observatory Z10, Fregenal de la sierra, Spain
? > >
? > >
? > >
? > >? ? CCD C/2023 Q1 16/08/2024
? > >
? > > 03:21 Z 17.1 GG C 31.5 8 960 0.40' CAR06 PGC
? > >
? > > Observatory Z10, Fregenal de la sierra, Spain
? > >
? > >
? > >
? > >? ? CCD C/2023 Q1 05/08/2024
? > >
? > > 02:33 Z 17.4 GG C 31.5 8 960 0.40' CAR06 PGC
? > >
? > > Observatory Z10, Fregenal de la sierra, Spain
? > >
? > >
? > >
? > >? ? CCD C/2023 Q1 16/07/2024
? > >
? > > 02:52 Z 17.5 GG C 31.5 8 1080 0.40' CAR06 PGC
? > >
? > > Observatory Z10, Fregenal de la sierra, Spain
? > >
? > >
? > >
? > >? ? CCD C/2023 Q1 10/07/2024
? > >
? > > 02:39 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
? > >
? > > Observatory Z10, Fregenal de la sierra, Spain
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >? ? From: [email protected] <[email protected]> on behalf of?
Thomas
? > >
? > > Lehmann via groups.io <t.lehmann@...> Sent: 26
? > >
? > > December 2024 22:19 To: [email protected] <[email protected]>
? > >
? > > Subject: [comets-ml] Unusual brightening of comet C/2023 Q1
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >? ? ? According to observations by S. Fritsche and myself the?
comet
? > >
? > > C/2023 Q1 has started a sudden brightening in November.?
Unfortunately
? > >
? > > our observations are very sparse due to the bad weather during the?
last
? > >
? > > two months. Our data suggest a brightening by 1-2 mag between?
October
? > >
? > > 26th and November 30th.? Latest measurement (green channel):
? > >
? > > 2024-12-23.46 UT, m1=14.1, coma diam. 5'? A more thorough?
investigation
? > >
? > > by using small aperture measurements is on the way.? Thanks to?
all
? > >
? > > contributors for sharing results and ideas/thoughts to this list.?
Merry
? > >
? > > Christmas and best wishes to all of you, Thomas
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >? ? ? This email and any attachments are intended solely for the?
use of
? > >
? > > the named recipients. If you are not the intended recipient you?
must not
? > >
? > > use, disclose, copy or distribute this email or any of its?
attachments
? > >
? > > and should notify the sender immediately and delete? this email?
from
? > >
? > > your system. UK Research and Innovation (UKRI) has taken every
? > >
? > > reasonable precaution to minimise risk of this email or any?
attachments
? > >
? > > containing viruses or malware but the recipient should carry out?
its own
? > >
? > > virus and malware checks before? opening the attachments. UKRI?
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? > > accept any liability for any losses or damages which the recipient?
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? > >
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? > >
? > >
? > >
? > >
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? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >
? > >?
? >
? >
? >
? >
? >?


?

Am Sat, 28 Dec 2024 12:31:51 +0000 (GMT)
schrieb "Denis Buczynski via groups.io" <buczynski8166@...>:

Hi again Thomas,
Thanks for posting this image. I agree it does show an extended
coma.When was this taken and with what instumentation? As you say
heavily processed, would such faint feature be visible to an observer at
a dark sky site. I know that there are obsevers who can see vaery faint
features that others cannot. I remember Brian Marsden commenting that
George Alcock was able to see very faint comet comas and tail
details(real) that were not seen by others.
Comet observing is so heavily influenced by observing conditons,
whether it be imaging or visually.
Why do you think we are seeing this extensive coma, there has been no
outburst of the central condensation. When 12p had central condensation
outbursts there seemed to be no substantial increase in the total
integrated magnitude. With this comet, are we seeing an increase in the
total integrated magnitude without any outburst of the central
condensation? How are we seeing material being released from the central
condensation into the coma to increase its brightness and overall size
without any sign of increased activity from the central condensation.
With 29p we see outbursts measured using small apertures which then
produce material to populate the coma and make it larger and brighter
and expanding.
Perhaps we can hear from some of the comet scientists in anwering these
questions.
As I said comets eh!
Best wishes
Denis


------ Original Message ------
From: t.lehmann@...
To: [email protected]
Sent: Saturday, December 28th 2024, 12:05
Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1



Hi Denis,

here is a heavily processed image. Pretty ugly though, but it might
serve for
illustration purposes.

Something I'd add to my "total" coma mesurement within 5': the
brighness
measurement (statistical) uncertainty is about 0.15mag.

Best wishes
Thomas


> Am Sat, 28 Dec 2024 11:43:28 +0000 (GMT)
> schrieb "Denis Buczynski via groups.io" :
>
> Hi Thomas,
> I appreciate all you say in this regard.
> I would be more convinced that there was an extensive coma present
if I
> could see an image showing this coma. Whether it be from fast f/2
> telescopes in excellent dark skies or from anywhere else . It only
> requires someone posting a current image showing an extensive coma
to
> put this "debate " to rest.We have yet to see one.
> Best wishes
> Denis Buczynski
>
>
> ------ Original Message ------
> From: t.lehmann@...
> To: jjgsgp@...
> Cc: [email protected]
> Sent: Saturday, December 28th 2024, 11:17
> Subject: Re: [comets-ml] Unusual brightening of comet C/2023
Q1
>
>
>
> Dear all,
>
> thanks for the numerous observation reports, especially to Denis's
and
> Peter's
> measurements over longer time span.
>
> I'd like to emphasize that any brightness measurement MUST be read
in
> conjunction to the measurement aperture used. The aperture
diameter
> MUST be
> taken into account when comparing data. The second important
parameter
> is
> the spectral range covered. The brightening from gaseous outbursts
can
> be
> more prominent in the green filtered images than in unfiltered (or
> red) images.
>
> About visual estimates.
> My report of 2024-12-23.46 UT, m1=14.1, coma diam. 5'
> is derived from images using a fast f/2.2 scope under excellent
skies
> having
> a limited stellar magnitude of 21mag and using heavy smoothing and
> contrast
> enhancement. I would be very much surprised if it would be
possible to
> detect
> the same amount of coma size visually. It is even harder for me to
> accept that
> I have missed 90% of the comets coma flux in my measurement -
which
> would be
> the case if the magnitude were near ~11.6mag - though I cannot
rule
> out some
> additional outburst has happened recently.
>
> Anyway, I'd like to encourage anyone to continue monitoring the
comet.
> For those doing imaging, it would be nice if you could measure the
> coma
> additionally using a true aperture diameter of d=15000km and
30000km
> at the
> comet (and report filter information) so we would be able to
construct
> a
> combined light curve of the inner coma brightness.
>
> Thanks
> Thomas
>
>
> > Am Sat, 28 Dec 2024 07:54:29 +0100
> > schrieb "jjgonzalez jjgonzalez via groups.io"
> <jjgsgp@...>:
> >
> > Thomas, Denis, Alan, all,
> >
> > Obviously, I am also interested in the confirmation of the large
and
> very
> > diffuse gas coma by visual observers from dark skies.
> >
> > Best regards,
> >
> > J. J. Gonzalez Suarez
> >
> > P.S.:
> >
> > As complementary information, this is the report of my recent
> observation
> > of the large dust coma of 29P :
> >
> > 29P/Schwassmann-Wachmann:
> > 2024 Dec. 27.00 UT: m1=11.1, Dia.=4', DC=2/, 20 cm SCT (77x).
> > ( Cubiellos - Sierra del Aramo, 1510 m, Asturias, Spain )
> >
> >
>
-----------------------------------------------------------------------------------------------------------
> >
> >
> > On Sat, Dec 28, 2024 at 5:39?AM Alan Hale via groups.io
> [email protected]> wrote:
> >
> > > Dear Denis, all,
> > >
> > >
> > >
> > > I’m attaching an image I took of C/2023 Q1 via LCO-Tenerife on
> December
> > > 26.97 UT (0.35-m Cassegrain, single 180-second image,
unprocessed,
> > > uncropped (dimensions 30x30 arcmin)). I’ve had some trouble
> getting
> > > measurements from the image (possible software issues), but
would
> > > “guesstimate” the magnitude to be somewhere around 15-15.5. I
had
> not
> > > imaged the comet previously so I can’t comment about any
recent
> brightening.
> > >
> > >
> > >
> > > For comparison, I’m also attaching an image I took of 29P on
> December
> > > 25.60 UT from LCO-Haleakala (0.35-m Cassegrain, single
150-second
> image,
> > > also unprocessed and uncropped, 30x30 arcmin). About eight
hours
> before I
> > > took this image I observed the comet visually at m1 = 11.7,
5.5’
> coma, DC
> > > ~1 (41 cm reflector, 70x).
> > >
> > >
> > >
> > >
> > >
> > > Sincerely,
> > >
> > > Alan
> > >
> > >
> > >
> > > Hello all,
> > >
> > > I must admit I am a little baffled by these reports of a
> substantial
> > >
> > > increase in brightness of C/2023 Q1.
> > >
> > > Firstly Thomas Lehmann reported an increase in the brightness
of
> this
> > >
> > > comet in November to mag 14.1 My observations made for
astrometry
> for
> > >
> > > the months of November and December (10 nights data) show the
> comet only
> > >
> > > increasing from mag 17 to mag 16.
> > >
> > > This is borne out by Peter Carson and Francois Kugel's
comments of
> their
> > >
> > > own observations and measurements.
> > >
> > > Now JJ Gonzalez is reporting an observation on the night of
Dec 27
> of
> > >
> > > this comet with a magnitude of 11.6.
> > >
> > > My last observation was a day or so earlier on Dec 25 and my
> Comphot
> > >
> > > measurement gives a magnitude of 15.73 with a coma diameter of
34
> arc
> > >
> > > secs.
> > >
> > > I attach my image.
> > >
> > > Can someone confirm the apparent +4 mag increase in
brightness
> or of
> > >
> > > mine, Peter Carson's and Francois Kugel's observation results?
> > >
> > >
> > >
> > > Comets eh!
> > >
> > > Happy NY
> > >
> > > Denis Buczynski
> > >
> > > BAA Comet Section
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > ------ Original Message ------
> > >
> > > From: jjgsgp@...
> > >
> > > To: [email protected]
> > >
> > > Sent: Friday, December 27th 2024, 23:52
> > >
> > > Subject: Re: [comets-ml] Unusual brightening of comet
> C/2023 Q1
> > >
> > >
> > >
> > >
> > >
> > > Thomas, all,After reading your email sent to the list
yesterday,
> I
> > >
> > > have arranged an observing session for tonight. This is the
report
> > >
> > > :C/2023 Q1 (PANSTARRS):2024 Dec. 27.81 UT: m1=11.6, Dia.=6',
> DC=1/, 20
> > >
> > > cm SCT (77x).[ From dark mountain skies the comet appears
visually
> much
> > >
> > > brighter than expected, showing a faint, large and very
diffuse
> outer
> > >
> > > coma. Nearby field stars checked in DSS. Limiting star
magnitude
> near
> > >
> > > comet : 14.2 (AQ).].( Cubiellos - Sierra del Aramo, 1510 m,
> Asturias,
> > >
> > > Spain ). All the best from the Cantabrian Mountains,J. J.
Gonzalez
> > >
> > >
> > >
>
Suarez--------------------------------------------------------------------------------------------------------------------------
> > >
> > >
> > >
> > >
> > >
> > > On Fri, Dec 27, 2024 at 5:28?PM Shanklin, Jonathan D. via
> groups.io
> > >
> > > <jdsh@...> wrote:
> > >
> > > My entry for the comet for The Astronomer magazine
> covering
> > >
> > > observations to the end of November and giving the behaviour
for
> > >
> > > November was:
> > >
> > > 2023 Q1 (PANSTARRS) observations cover: -144 to -16 days,
2.6 –
> 3.0
> > >
> > > au
> > >
> > > At 17.5, steady (Carson, Pappa)
> > >
> > >
> > >
> > > Which does suggest that the brightness seen in December is
> > >
> > > unexpected.
> > >
> > >
> > >
> > > I won’t start putting the TA column for the next issue
together
> until
> > >
> > > around January 4.
> > >
> > >
> > >
> > >
> > >
> > > Regards,
> > >
> > >
> > >
> > > Jonathan Shanklin
> > >
> > > BAA Comet Section visual observations co-ordinator
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > From: [email protected] <[email protected]> On Behalf
Of
> Peter
> > >
> > > Carson via groups.io Sent: Friday, December 27, 2024 3:37 PM
To:
> > >
> > > [email protected] Subject: [comets-ml] Unusual brightening
of
> comet
> > >
> > > C/2023 Q1
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > You don't often get email from
> > >
> > > petercarson100@.... Learn why this is
important
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Hello Thomas,
> > >
> > >
> > >
> > > Here are my observations from summer to now.
Unfortunately, I
> made
> > >
> > > no observations in October and early November, so although the
> comet has
> > >
> > > brightened, it is not clear if the brightening occurred over
a
> short or
> > >
> > > long period.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > All the best
> > >
> > >
> > >
> > > Peter
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Type Comet Obs date Meth
> > >
> > > Mag Refcat Inst T App Inst F Inst P Coma User Location
> > >
> > >
> > >
> > > CCD C/2023 Q1 22/12/2024
> > >
> > > 21:11 Z 15.6 GG C 31.5 8 1260 0.80' CAR06 PGC
> > >
> > > Observatory Z10, Fregenal de la sierra, Spain
> > >
> > >
> > >
> > > CCD C/2023 Q1 10/12/2024
> > >
> > > 03:18 Z 15.9 GG C 31.5 8 1200 0.80' CAR06 PGC
> > >
> > > Observatory Z10, Fregenal de la sierra, Spain
> > >
> > >
> > >
> > > CCD C/2023 Q1 27/11/2024
> > >
> > > 02:43 Z 16.1 GG C 31.5 8 1200 0.80' CAR06 PGC
> > >
> > > Observatory Z10, Fregenal de la sierra, Spain
> > >
> > >
> > >
> > > CCD C/2023 Q1 04/09/2024
> > >
> > > 01:48 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
> > >
> > > Observatory Z10, Fregenal de la sierra, Spain
> > >
> > >
> > >
> > > CCD C/2023 Q1 16/08/2024
> > >
> > > 03:21 Z 17.1 GG C 31.5 8 960 0.40' CAR06 PGC
> > >
> > > Observatory Z10, Fregenal de la sierra, Spain
> > >
> > >
> > >
> > > CCD C/2023 Q1 05/08/2024
> > >
> > > 02:33 Z 17.4 GG C 31.5 8 960 0.40' CAR06 PGC
> > >
> > > Observatory Z10, Fregenal de la sierra, Spain
> > >
> > >
> > >
> > > CCD C/2023 Q1 16/07/2024
> > >
> > > 02:52 Z 17.5 GG C 31.5 8 1080 0.40' CAR06 PGC
> > >
> > > Observatory Z10, Fregenal de la sierra, Spain
> > >
> > >
> > >
> > > CCD C/2023 Q1 10/07/2024
> > >
> > > 02:39 Z 17.5 GG C 31.5 8 1200 0.40' CAR06 PGC
> > >
> > > Observatory Z10, Fregenal de la sierra, Spain
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > From: [email protected] <[email protected]> on behalf
of
> Thomas
> > >
> > > Lehmann via groups.io <t.lehmann@...> Sent:
26
> > >
> > > December 2024 22:19 To: [email protected]
<[email protected]>
> > >
> > > Subject: [comets-ml] Unusual brightening of comet C/2023 Q1
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > According to observations by S. Fritsche and myself the
> comet
> > >
> > > C/2023 Q1 has started a sudden brightening in November.
> Unfortunately
> > >
> > > our observations are very sparse due to the bad weather during
the
> last
> > >
> > > two months. Our data suggest a brightening by 1-2 mag between
> October
> > >
> > > 26th and November 30th. Latest measurement (green channel):
> > >
> > > 2024-12-23.46 UT, m1=14.1, coma diam. 5' A more thorough
> investigation
> > >
> > > by using small aperture measurements is on the way. Thanks
to
> all
> > >
> > > contributors for sharing results and ideas/thoughts to this
list.
> Merry
> > >
> > > Christmas and best wishes to all of you, Thomas
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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the
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> > >
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> must not
> > >
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> > >
> > > and should notify the sender immediately and delete this
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