Dear all, ? I managed to get several images from LCO-Tenerife (codes Z17 and Z21, 0.35-m Cassegrain) last night. This object is clearly cometary (or, perhaps, a disrupted asteroid). Small, condensed coma, with a sharp tail initially extending towards p.a. 275 for about 0.2 arcminutes, then bending towards p.a. 285 for an additional 0.9 arcminutes. ? I¡¯m attaching one of the images. (Apologies for the satellite trail, but this is the best of the images I got.) Negative image, and I¡¯ve enhanced the contrast somewhat. Field dimensions 10x8 arcminutes. ? ? Sincerely, Alan ? STEREO-A had similar/somewhat better viewing geometry in 2007, but there's nothing in HI1A down to mag 14-15 within ~20 sigma (~2 days) of the JPL ephemeris position, so it definitely isn't always this bright at every apparition, and there's a good chance this object recently reactivated following a disruption. On Monday, November 11, 2024 at 10:45:00 a.m. MST, planetaryscience via groups.io <planetaryscience@...> wrote: It doesn't seem to be visible in 2020/05/24 Subaru images down to magnitude r=21.8 or so. Despite its short period, its near-4:17 resonance makes searching for previous apparitions very difficult (it last had similar geometry back in 2007!) On Monday, November 11, 2024 at 07:17:30 AM EST, Roberto via groups.io <me3540@...> wrote: Using FindOrb with planetary perturbations produces residuals that are
not very high (the average residual is 0".52). I don't have the data
here but if I remember correctly no residual exceeds 1".7 and
considering that it is now very low on the horizon they are not that
bad.
Roberto Haver
157 Frasso Sabino
On Mon, 11 Nov 2024 11:31:17 +0100
? "Luca Buzzi via groups.io" <lucabuzzi.204@...>
wrote:
> Moreover, residuals in the MPEC are bad. Maybe perturbations or non
>gravs
> must be put in the solution?
>
> Luca
> #204
>
> Il giorno lun 11 nov 2024 alle ore 11:00 Qicheng Zhang via groups.io
> <qzalaska@...> ha scritto:
>
>> Just noticed the updated orbit put it barely within the HI1A field
>>of view
>> on October 4, cutting across the lower left corner, and it's
>>definitely a
>> comet. I attached a ~30' wide crop of 29 frames, aligned with Sun =
>>up,
>> showing a clear antisunward tail extending at least 15' to the frame
>>edge.
>> Roughly mag 12.6 at the time.
>>
>> Qicheng
>>
>> On Monday, November 11, 2024 at 02:25:46 a.m. MST, Qicheng Zhang via
>> groups.io <qzalaska@...> wrote:
>>
>>
>> It was briefly on the PCCP, but seems like might have only been
>>added for
>> its orbit (while it was e~1) and was taken off once the July
>>observations
>> confirmed its short period. However, it has an orbit rather similar
>>to
>> 169P/NEAT and could be another fragment of that complex, so activity
>>would
>> not be surprising.
>>
>> Qicheng
>>
>> On Monday, November 11, 2024 at 02:18:32 a.m. MST, Peter Birtwhistle
>>via
>> groups.io <peter@...> wrote:
>>
>>
>> MPEC 2024-V132 includes observations of 2024 OC2 from four
>>observatories
>> in the last few days showing it to be up to 3 mags brighter than
>> prediction. It was at perihelion last month with q = 0.6 AU.
>>
>>
>>
>> Has anyone checked it for activity?
>>
>> Peter
>> J95
>>
>>
>>
>
>
>
>
>
|
Thank you. Later today I'll review my images with the new ephemerides.
Luca?
Il mar 12 nov 2024, 11:43 reinder j bouma via <rjbouma= [email protected]> ha scritto: Op 12-11-2024 om 10:25 schreef Luca Buzzi via :
> Hi Maik,
> this object was observed for one day, covering approx. 30 arcminutes.
> It seems quite strange to me that nobody else looked at it for the
> following 24 days. Maybe someone tried but failed to see it?
> Anyway, uncertainty for Nov. 2 and 6 was about 10-12 arcminutes so
> quite easy to find.
> Can we see an image from codes W62 and/or M35? I think we can trust
> W62, I've never heard before of M35.
>
> Regards,
> Luca
> # 204
>
>
Hi Luca, Maik,
There just has been an update to the PCCP for this object.
The observations of M35 have been removed.
Let's hope the object will now be definitely confirmed soon.
Best regards,
Reinder
|
Op 12-11-2024 om 10:25 schreef Luca Buzzi via groups.io: Hi Maik,
this object was observed for one day, covering approx. 30 arcminutes. It seems quite strange to me that nobody else looked at it for the following 24 days. Maybe someone tried but failed to see it?
Anyway, uncertainty for Nov. 2 and 6 was about 10-12 arcminutes so quite easy to find.
Can we see an image from codes W62 and/or M35? I think we can trust W62, I've never heard before of M35.
Regards,
Luca
# 204
Hi Luca, Maik, There just has been an update to the PCCP for this object. The observations of M35 have been removed. Let's hope the object will now be definitely confirmed soon. Best regards, Reinder
|
Hi Maik, this object was observed for one day, covering approx. 30 arcminutes. It seems quite strange to me that nobody else looked at it for the following 24 days. Maybe someone tried but failed to see it?
Anyway, uncertainty for Nov. 2 and 6 was about 10-12 arcminutes so quite easy to find. Can we see an image from codes W62 and/or M35? I think we can trust W62, I've never heard before of M35.
Regards, Luca # 204
Il giorno mar 12 nov 2024 alle ore 10:57 Maik Meyer via <maik= [email protected]> ha scritto: Hello Luca, all,
> I tried to observe MHO07B4 but I cannot find anything down to at least
> mag.21.
> I think W16 discovery is real, given that other trusted observatories
> observed it many days ago (858, H21).
> But after 24 days other observations came in, and I presume these are
> not real.
> Anyone tried to observe it as well?
this is really an interesting situation.
We have several tracklets of Oct 9 and 10, then one of Nov 2 and one of Nov 10.
One can derive reasonable orbits with several combinations of these tracklets. These cover quite a large range of
eccentricities (0.35 - 1.0).
I agree that probably one or both of the November tracklets do not belong to the October observations.
CS
Maik
--
"One cannot discover comets lying in bed." * Lewis Swift
________________________________________________________________________
*** @skymorph.bsky.social
|
Hello Luca, all, I tried to observe MHO07B4 but I cannot find anything down to at least
mag.21.
I think W16 discovery is real, given that other trusted observatories
observed it many days ago (858, H21).
But after 24 days other observations came in, and I presume these are
not real.
Anyone tried to observe it as well? this is really an interesting situation. We have several tracklets of Oct 9 and 10, then one of Nov 2 and one of Nov 10. One can derive reasonable orbits with several combinations of these tracklets. These cover quite a large range of eccentricities (0.35 - 1.0). I agree that probably one or both of the November tracklets do not belong to the October observations. CS Maik -- "One cannot discover comets lying in bed." * Lewis Swift ________________________________________________________________________ *** @skymorph.bsky.social
|
STEREO-A had similar/somewhat better viewing geometry in 2007, but there's nothing in HI1A down to mag 14-15 within ~20 sigma (~2 days) of the JPL ephemeris position, so it definitely isn't always this bright at every apparition, and there's a good chance this object recently reactivated following a disruption.
Qicheng
On Monday, November 11, 2024 at 10:45:00 a.m. MST, planetaryscience via groups.io <planetaryscience@...> wrote:
Hi all,
It doesn't seem to be visible in 2020/05/24 Subaru images down to magnitude r=21.8 or so. Despite its short period, its near-4:17 resonance makes searching for previous apparitions very difficult (it last had similar geometry back in 2007!)
~Sam
On Monday, November 11, 2024 at 07:17:30 AM EST, Roberto via groups.io <me3540@...> wrote:
Using FindOrb with planetary perturbations produces residuals that are not very high (the average residual is 0".52). I don't have the data here but if I remember correctly no residual exceeds 1".7 and considering that it is now very low on the horizon they are not that bad. Roberto Haver 157 Frasso Sabino On Mon, 11 Nov 2024 11:31:17 +0100 ? "Luca Buzzi via groups.io" <lucabuzzi.204@...> wrote: > Moreover, residuals in the MPEC are bad. Maybe perturbations or non >gravs > must be put in the solution? > > Luca > #204 > > Il giorno lun 11 nov 2024 alle ore 11:00 Qicheng Zhang via groups.io > <qzalaska@...> ha scritto: > >> Just noticed the updated orbit put it barely within the HI1A field >>of view >> on October 4, cutting across the lower left corner, and it's >>definitely a >> comet. I attached a ~30' wide crop of 29 frames, aligned with Sun = >>up, >> showing a clear antisunward tail extending at least 15' to the frame >>edge. >> Roughly mag 12.6 at the time. >> >> Qicheng >> >> On Monday, November 11, 2024 at 02:25:46 a.m. MST, Qicheng Zhang via >> groups.io <qzalaska@...> wrote: >> >> >> It was briefly on the PCCP, but seems like might have only been >>added for >> its orbit (while it was e~1) and was taken off once the July >>observations >> confirmed its short period. However, it has an orbit rather similar >>to >> 169P/NEAT and could be another fragment of that complex, so activity >>would >> not be surprising. >> >> Qicheng >> >> On Monday, November 11, 2024 at 02:18:32 a.m. MST, Peter Birtwhistle >>via >> groups.io <peter@...> wrote: >> >> >> MPEC 2024-V132 includes observations of 2024 OC2 from four >>observatories >> in the last few days showing it to be up to 3 mags brighter than >> prediction. It was at perihelion last month with q = 0.6 AU. >> >> >> >> Has anyone checked it for activity? >> >> Peter >> J95 >> >> >> > > > > >
|
Hi all,
It doesn't seem to be visible in 2020/05/24 Subaru images down to magnitude r=21.8 or so. Despite its short period, its near-4:17 resonance makes searching for previous apparitions very difficult (it last had similar geometry back in 2007!)
~Sam
On Monday, November 11, 2024 at 07:17:30 AM EST, Roberto via groups.io <me3540@...> wrote:
Using FindOrb with planetary perturbations produces residuals that are not very high (the average residual is 0".52). I don't have the data here but if I remember correctly no residual exceeds 1".7 and considering that it is now very low on the horizon they are not that bad. Roberto Haver 157 Frasso Sabino On Mon, 11 Nov 2024 11:31:17 +0100 ? "Luca Buzzi via groups.io" <lucabuzzi.204@...> wrote: > Moreover, residuals in the MPEC are bad. Maybe perturbations or non >gravs > must be put in the solution? > > Luca > #204 > > Il giorno lun 11 nov 2024 alle ore 11:00 Qicheng Zhang via groups.io > <qzalaska@...> ha scritto: > >> Just noticed the updated orbit put it barely within the HI1A field >>of view >> on October 4, cutting across the lower left corner, and it's >>definitely a >> comet. I attached a ~30' wide crop of 29 frames, aligned with Sun = >>up, >> showing a clear antisunward tail extending at least 15' to the frame >>edge. >> Roughly mag 12.6 at the time. >> >> Qicheng >> >> On Monday, November 11, 2024 at 02:25:46 a.m. MST, Qicheng Zhang via >> groups.io <qzalaska@...> wrote: >> >> >> It was briefly on the PCCP, but seems like might have only been >>added for >> its orbit (while it was e~1) and was taken off once the July >>observations >> confirmed its short period. However, it has an orbit rather similar >>to >> 169P/NEAT and could be another fragment of that complex, so activity >>would >> not be surprising. >> >> Qicheng >> >> On Monday, November 11, 2024 at 02:18:32 a.m. MST, Peter Birtwhistle >>via >> groups.io <peter@...> wrote: >> >> >> MPEC 2024-V132 includes observations of 2024 OC2 from four >>observatories >> in the last few days showing it to be up to 3 mags brighter than >> prediction. It was at perihelion last month with q = 0.6 AU. >> >> >> >> Has anyone checked it for activity? >> >> Peter >> J95 >> >> >> > > > > >
|
Using FindOrb with planetary perturbations produces residuals that are not very high (the average residual is 0".52). I don't have the data here but if I remember correctly no residual exceeds 1".7 and considering that it is now very low on the horizon they are not that bad. Roberto Haver 157 Frasso Sabino On Mon, 11 Nov 2024 11:31:17 +0100 "Luca Buzzi via groups.io" <lucabuzzi.204@...> wrote: Moreover, residuals in the MPEC are bad. Maybe perturbations or non gravs
must be put in the solution?
Luca
#204
Il giorno lun 11 nov 2024 alle ore 11:00 Qicheng Zhang via groups.io
<qzalaska@...> ha scritto:
Just noticed the updated orbit put it barely within the HI1A field of view
on October 4, cutting across the lower left corner, and it's definitely a
comet. I attached a ~30' wide crop of 29 frames, aligned with Sun = up,
showing a clear antisunward tail extending at least 15' to the frame edge.
Roughly mag 12.6 at the time.
Qicheng
On Monday, November 11, 2024 at 02:25:46 a.m. MST, Qicheng Zhang via
groups.io <qzalaska@...> wrote:
It was briefly on the PCCP, but seems like might have only been added for
its orbit (while it was e~1) and was taken off once the July observations
confirmed its short period. However, it has an orbit rather similar to
169P/NEAT and could be another fragment of that complex, so activity would
not be surprising.
Qicheng
On Monday, November 11, 2024 at 02:18:32 a.m. MST, Peter Birtwhistle via
groups.io <peter@...> wrote:
MPEC 2024-V132 includes observations of 2024 OC2 from four observatories
in the last few days showing it to be up to 3 mags brighter than
prediction. It was at perihelion last month with q = 0.6 AU.
Has anyone checked it for activity?
Peter
J95
|
Also, if anyone wants to see it for themselves in the HI1A images, it's actually fairly visible even in single frames. A couple good ones (x=y=0=lower left):
2024-10-04 02:48:31 x=6, y=11
2024-10-04 08:08:31 x=31, y=8
Qicheng
On Monday, November 11, 2024 at 03:00:48 a.m. MST, Qicheng Zhang via groups.io <qzalaska@...> wrote:
Just noticed the updated orbit put it barely within the HI1A field of view on October 4, cutting across the lower left corner, and it's definitely a comet. I attached a ~30' wide crop of 29 frames, aligned with Sun = up, showing a clear antisunward tail extending at least 15' to the frame edge. Roughly mag 12.6 at the time.
Qicheng
On Monday, November 11, 2024 at 02:25:46 a.m. MST, Qicheng Zhang via groups.io <qzalaska@...> wrote:
It was briefly on the PCCP, but seems like might have only been added for its orbit (while it was e~1) and was taken off once the July observations confirmed its short period. However, it has an orbit rather similar to 169P/NEAT and could be another fragment of that complex, so activity would not be surprising.
Qicheng
On Monday, November 11, 2024 at 02:18:32 a.m. MST, Peter Birtwhistle via groups.io <peter@...> wrote:
MPEC 2024-V132 includes observations of 2024 OC2 from four observatories in the last few days showing it to be up to 3 mags brighter than prediction. It was at perihelion last month with q = 0.6 AU.
?
?
Has anyone checked it for activity?
?
Peter
J95
|
Moreover, residuals?in the MPEC are bad. Maybe perturbations or non gravs must be put in the solution? Luca #204
Il giorno lun 11 nov 2024 alle ore 11:00 Qicheng Zhang via <qzalaska= [email protected]> ha scritto:
Just noticed the updated orbit put it barely within the HI1A field of view on October 4, cutting across the lower left corner, and it's definitely a comet. I attached a ~30' wide crop of 29 frames, aligned with Sun = up, showing a clear antisunward tail extending at least 15' to the frame edge. Roughly mag 12.6 at the time.
Qicheng
On Monday, November 11, 2024 at 02:25:46 a.m. MST, Qicheng Zhang via <qzalaska= [email protected]> wrote:
It was briefly on the PCCP, but seems like might have only been added for its orbit (while it was e~1) and was taken off once the July observations confirmed its short period. However, it has an orbit rather similar to 169P/NEAT and could be another fragment of that complex, so activity would not be surprising.
Qicheng
On Monday, November 11, 2024 at 02:18:32 a.m. MST, Peter Birtwhistle via <peter= [email protected]> wrote:
MPEC 2024-V132 includes observations of 2024 OC2 from four observatories in the last few days showing it to be up to 3 mags brighter than prediction. It was at perihelion last month with q = 0.6 AU.
?
?
Has anyone checked it for activity?
?
Peter
J95
|
Just noticed the updated orbit put it barely within the HI1A field of view on October 4, cutting across the lower left corner, and it's definitely a comet. I attached a ~30' wide crop of 29 frames, aligned with Sun = up, showing a clear antisunward tail extending at least 15' to the frame edge. Roughly mag 12.6 at the time.
Qicheng
On Monday, November 11, 2024 at 02:25:46 a.m. MST, Qicheng Zhang via groups.io <qzalaska@...> wrote:
It was briefly on the PCCP, but seems like might have only been added for its orbit (while it was e~1) and was taken off once the July observations confirmed its short period. However, it has an orbit rather similar to 169P/NEAT and could be another fragment of that complex, so activity would not be surprising.
Qicheng
On Monday, November 11, 2024 at 02:18:32 a.m. MST, Peter Birtwhistle via groups.io <peter@...> wrote:
MPEC 2024-V132 includes observations of 2024 OC2 from four observatories in the last few days showing it to be up to 3 mags brighter than prediction. It was at perihelion last month with q = 0.6 AU.
?
?
Has anyone checked it for activity?
?
Peter
J95
|
It was briefly on the PCCP, but seems like might have only been added for its orbit (while it was e~1) and was taken off once the July observations confirmed its short period. However, it has an orbit rather similar to 169P/NEAT and could be another fragment of that complex, so activity would not be surprising.
Qicheng
On Monday, November 11, 2024 at 02:18:32 a.m. MST, Peter Birtwhistle via groups.io <peter@...> wrote:
MPEC 2024-V132 includes observations of 2024 OC2 from four observatories in the last few days showing it to be up to 3 mags brighter than prediction. It was at perihelion last month with q = 0.6 AU.
?
?
Has anyone checked it for activity?
?
Peter
J95
|
MPEC 2024-V132 includes observations of 2024 OC2 from four observatories in the last few days showing it to be up to 3 mags brighter than prediction. It was at perihelion last month with q = 0.6 AU.
?
?
Has anyone checked it for activity?
?
Peter
J95
|
Re: Possible crossing of C/2023 A3's ion tail during October 10-13
Hello,
?
Were any ground-based geomagnetic effects detected from the ion tail? Geomagnetic activity was very high on October 10th and 11th so it will have been very difficult to distinguish any effect from the comet's tail.
?
Kind regards,
?
Nick Quinn
|
Gary Hug confirmed my solution :-)
Thanks Gary! ? K.
S¨¢rneczky Kriszti¨¢n via <siraly74= [email protected]> ezt ¨ªrta (id?pont: 2024. nov. 10., V, 11:27):
Hi all,
I found az interesting object in this morning, but in my opinion, the PCCP ephemerides are wrong. The object is slower than the PCCP ephemerides shows. Here are my online FindOrb calculations:
Date (UTC) HH RA Dec delta r elong mag '/hr PA " sig PA
---- -------- ------------ ------------ ------ ------ ----- --- ------- ------ --------
2024 11 10 10 11 05 21.811 +32 10 41.31 .20622 .95874 75.3 20.0 3.844 42.6 16.8 152
2024 11 10 11 11 05 34.172 +32 13 30.50 .20634 .95881 75.3 20.0 3.853 43.1 20.9 158
2024 11 10 12 11 05 46.679 +32 16 19.00 .20646 .95889 75.3 20.0 3.867 43.5 25.3 164
2024 11 10 13 11 05 59.342 +32 19 07.08 .20657 .95896 75.4 20.0 3.886 43.9 29.9 171
2024 11 10 14 11 06 12.159 +32 21 55.02 .20669 .95904 75.4 20.0 3.907 44.2 35.0 13
2024 11 10 15 11 06 25.121 +32 24 43.06 .20681 .95912 75.4 20.0 3.929 44.4 44.7 67
2024 11 10 16 11 06 38.206 +32 27 31.46 .20693 .95919 75.4 20.0 3.949 44.6 58.2 78
2024 11 10 17 11 06 51.385 +32 30 20.39 .20704 .95927 75.4 20.0 3.967 44.6 73.5 83
2024 11 10 18 11 07 04.625 +32 33 09.99 .20715 .95935 75.5 20.0 3.981 44.6 90.0 87
2024 11 10 19 11 07 17.886 +32 36 00.33 .20727 .95942 75.5 20.0 3.989 44.5 108 91
Best,
K.
|
Hi all,
I found az interesting object in this morning, but in my opinion, the PCCP ephemerides are wrong. The object is slower than the PCCP ephemerides shows. Here are my online FindOrb calculations:
Date (UTC) HH RA Dec delta r elong mag '/hr PA " sig PA
---- -------- ------------ ------------ ------ ------ ----- --- ------- ------ --------
2024 11 10 10 11 05 21.811 +32 10 41.31 .20622 .95874 75.3 20.0 3.844 42.6 16.8 152
2024 11 10 11 11 05 34.172 +32 13 30.50 .20634 .95881 75.3 20.0 3.853 43.1 20.9 158
2024 11 10 12 11 05 46.679 +32 16 19.00 .20646 .95889 75.3 20.0 3.867 43.5 25.3 164
2024 11 10 13 11 05 59.342 +32 19 07.08 .20657 .95896 75.4 20.0 3.886 43.9 29.9 171
2024 11 10 14 11 06 12.159 +32 21 55.02 .20669 .95904 75.4 20.0 3.907 44.2 35.0 13
2024 11 10 15 11 06 25.121 +32 24 43.06 .20681 .95912 75.4 20.0 3.929 44.4 44.7 67
2024 11 10 16 11 06 38.206 +32 27 31.46 .20693 .95919 75.4 20.0 3.949 44.6 58.2 78
2024 11 10 17 11 06 51.385 +32 30 20.39 .20704 .95927 75.4 20.0 3.967 44.6 73.5 83
2024 11 10 18 11 07 04.625 +32 33 09.99 .20715 .95935 75.5 20.0 3.981 44.6 90.0 87
2024 11 10 19 11 07 17.886 +32 36 00.33 .20727 .95942 75.5 20.0 3.989 44.5 108 91
Best,
K.
|
Dear all,
I tried to observe MHO07B4 but I cannot find anything down to at least
mag.21.
I think W16 discovery is real, given that other trusted observatories
observed it many days ago (858, H21).
But after 24 days other observations came in, and I presume these are
not real.
Anyone tried to observe it as well?
Luca
# 204
--
Questa email ¨¨ stata esaminata alla ricerca di virus dal software antivirus AVG.
www.avg.com
|
Hi all,
In the circular came the confirmation that the object P121pLi is a comet (C/2024 U1) with also my observation (from the observatory 157 of Frasso Sabino) and confirmation made the night between November 2 and 3 (together with 2 other professional telescopes).The image you see is exactly the one where I detected a FWHM about 20% higher than the surrounding stars (the stars between them had an error on the FWHM of 3%) and perhaps with a slight elongation.It is always necessary to make precise measurements of the FWHM because even if to the eye it does not seem to have a coma only the measurements can give certainty.The actual detected coma seems to be 8" with an M1 of 18.8 (on the circular I gave a value of 19.8 because the circle used was smaller and so let's say it was an M2, nucleus magnitude). They are 40x90s mean time (of 3/11/2024) 01h05m33s UT, scale 1".24/pixel, field 21'.6x32'.3. North perfectly up and east to the left.
Regards,
Roberto Haver
157 Frasso Sabino
|
Apologize for the message header, not sure how I typed C/13P/Olbers, the edit will not let me correct that error.
|
Comet 13P/Olbers continues to stay relatively bright even so long after perihelion. On the evening of 2024 November 5 UT 13P was magnitude G=10.0 as calculated from 30x10 second images in an aperture diameter of 4'. The images were collected at an altitude around 4 degrees which did not show the comet very well in the color image as twilight was fading in a hazy sky. The comet has stayed right around magnitude 10 for the last 10 days as calculated from the other images and has only faded about a magnitude in the past 2 months, at this rate 13P may become the brightest comet in our skies again if C/2023 A3 (Tsuchinshan-ATLAS) continues to fade as quickly as it has in the past few weeks.
|
reinder j bouma
Mike Olason
