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swan_ARecl_sm_20241205_0002.gif - x 188 y 301
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Hi Roberto, all, ? Nice job Roberto! ? I can confirm that this object is exhibiting cometary behavior. On images I took yesterday with LCO-Tenerife (0.35-m Cassegrain) it is clearly showing a small condensed coma and a short westward-pointing tail. Attached image is 300-seconds, 5x5 arcminutes, standard orientation (north up, east right), taken December 8 at 23:58 UT. ? Sincerely, Alan ? Object 2015 CD60 is definitely a comet. From images taken on December 2nd (unfortunately analyzed only today) I noticed that the object 2015CD60 (object that I follow together with others to see if it has cometary activity) is definitely a comet with These are the data of the object: 2015CD60 Mag. 18.0 for a coma of about 10" with a tail of about 42" in Taken with a 369mm Cassegrain reduced to F/6.88 (2493mm focal length) on December 2nd 2024 (mean time 01h12m22s UT) with 46x90s and a limiting magnitude of about 22. Image scale 1".24/pixel north up but slightly tilted to the left by 4¡ã and east therefore to the left. I also took it on November 1, 2024 and it showed no activity (it was even more difficult to understand due to the presence of many annoying
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On 12/9/24 11:30, grymiki via groups.io wrote: And question no. 2 - i have diacritic sign in my name but CBAT email should contain plain ASCII code - it doesn't exist for my sign I _think_ the advice given here applies (you may need to check with the CBAT folks) : So for Miko?aj, send Miko\laj. (Ideally, they'd use Unicode. Though perhaps with an alternative name line allowed or required, so that (for example) the discoverer of the comet 2I/Borisov could report "my name is §¤. §£. §¢§à§â§Ú?§ã§à§Ó, which transliterates to G. V. Borisov." I _would_ want that extra line, since I can't read Chinese, Hebrew, Thai, etc.) -- Bill
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My advice is not to send anything to CBAT that only appears in 3 SWAN images; I would consider 4 images a bare minimum. Personally, I don¡¯t see any moving objects that disappear behind the black solar-occulting
region in recent images. If the object you¡¯re considering is near pixel X=186, Y=283, then that is the blue supergiant star mu Sagittarii.? --Rob
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From: [email protected] <[email protected]>
On Behalf Of grymiki via groups.io
Sent: Monday, December 9, 2024 8:30 AM
To: [email protected]
Subject: EXTERNAL: Re: [comets-ml] SWAN comet hunting
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[Edited Message Follows]
I think I have found something. The sky wasn't searched in that region and the object is seen in 2-3 images, but it then disappears behind this black thingy covering? Sun on the left.
And question no. 2 - i have diacritic sign in my name but CBAT email should contain plain ASCII code - it doesn't exist for my sign
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I think I have found something. The sky wasn't searched in that region and the object is seen in 2-3 images, but it then disappears behind this black thingy covering? Sun on the left.
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Hi Miko?aj,
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In this case, 2015 CD60 would be formally considered a Jupiter-family comet from a dynamical standpoint (commonly used in the active asteroids literature)--the distinction being that 2015 CD60's Tisserand's parameter (T_J = 2.6) with respect to Jupiter is less than T_J = 3.08 which separates "Jupiter-family comets" (whose orbits come close to Jupiter, loosely speaking) from "active asteroids", whose orbits are less affected by Jupiter.
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K
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Good night, Mikolaj!
Close but not exactly. On 4/12 333P was 7-8 degrees above your mark.
On 3/12 this comet was in X-Y position at 335-196 (0,0 - upper left) - in the attached SWAN image it is easily visible.
Vladimir.
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Tail presence doesn't necessarily mean it is a comet. There are asteroids that have their tails.
Nice photo :P
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--Miko?aj Kaszczyk
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Object 2015 CD60 is definitely a comet.
From images taken on December 2nd (unfortunately analyzed only today) I noticed that the object 2015CD60 (object that I follow together with others to see if it has cometary activity) is definitely a comet with a tail too!
These are the data of the object:
2015CD60 Mag. 18.0 for a coma of about 10" with a tail of about 42" in PA 277¡ã.
Photo data:
Taken with a 369mm Cassegrain reduced to F/6.88 (2493mm focal length) on December 2nd 2024 (mean time 01h12m22s UT) with 46x90s and a limiting magnitude of about 22. Image scale 1".24/pixel north up but slightly tilted to the left by 4¡ã and east therefore to the left. Field of 21'.6x32'.3.
I also took it on November 1, 2024 and it showed no activity (it was even more difficult to understand due to the presence of many annoying stars nearby).
Regards,
Roberto Haver
157 Frasso Sabino
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 is it 333P?
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As I know, SOHO mission will be certainly working until end of 2025, but it might be extended ¨C it goes very well ¨C but the time will tell.
Thank you all for help!
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Re: P223bel = COMET 213P-B/VAN NESS
Hi Sam, Piero, Adrien, all, ? I¡¯m inclined to suspect that this comet has indeed undergone an outburst, or at least some kind of upsurge in brightness, during the fairly recent past, given that it is over a year past perihelion passage and is just now being observed. ? It was clearly fainter this time around than it was in 2017, when I successfully observed it visually on a handful of occasions near m1 ~13.5. I made at least one attempt to recover it via LCO in May 2023, when it was a? month away from opposition and six months away from perihelion, but didn¡¯t detect anything in the images. I¡¯m aware of at least a couple of other unsuccessful recovery attempts by other observers. ? It will be interesting to see what the DECam images reveal. ? ? Sincerely, Alan ? It has been officially identified by the MPC as 213P... I'm not 100% sure that identification is correct due to the magnitude difference, but this comet is prone to outbursts so it's hard to say for sure. There are September 2023 DECam images at the comet's expected location which are proprietary until March which would help clear up the confusion. If it isn't 213P, it's definitely NOT 213P-B. I calculated an orbit including -B's 2011 observations and these 2024 observations, and there is nothing at the expected position down to at least V=23.5 in 2017 (a full ten magnitudes fainter than the main comet at the time). As best as I can tell -B disintegrated in 2011 (Sekanina models that it separated from the main comet in 2005 shortly before discovery) The comet also produced -C and -D fragments which were absorbed even more sparsely in 2011. On Saturday, December 7, 2024 at 11:49:47 AM PST, Sormano Astronomical Observatory <obs2.sormano@...> wrote:
As far as I know, in addition to the main one, we only have the B component. The problem to be clarified is whether the observations of PCCP - P223bel - are to be referred to 213P or 213P-B.
Given the small arc of P223bel and the similarity of the orbits, both possibilities remain open. My choice fell on 213P-B only because, from a quick calculation, the observations of the latter fit better. In any case a more in-depth analysis? surely will be able to solve the problem.
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Re: P223bel = COMET 213P-B/VAN NESS
Hi Piero and Adrien,
It has been officially identified by the MPC as 213P... I'm not 100% sure that identification is correct due to the magnitude difference, but this comet is prone to outbursts so it's hard to say for sure. There are September 2023 DECam images at the comet's expected location which are proprietary until March which would help clear up the confusion.
If it isn't 213P, it's definitely NOT 213P-B. I calculated an orbit including -B's 2011 observations and these 2024 observations, and there is nothing at the expected position down to at least V=23.5 in 2017 (a full ten magnitudes fainter than the main comet at the time). As best as I can tell -B disintegrated in 2011 (Sekanina models that it separated from the main comet in 2005 shortly before discovery)
The comet also produced -C and -D fragments which were absorbed even more sparsely in 2011.
~Sam
On Saturday, December 7, 2024 at 11:49:47 AM PST, Sormano Astronomical Observatory <obs2.sormano@...> wrote:
Hi Adrien,
As far as I know, in addition to the main one, we only have the B component. The problem to be clarified is whether the observations of PCCP - P223bel - are to be referred to 213P or 213P-B.
Given the small arc of P223bel and the similarity of the orbits, both possibilities remain open. My choice fell on 213P-B only because, from a quick calculation, the observations of the latter fit better.
In any case a more in-depth analysis? surely will be able to solve the problem.
?
Regards
Piero Sicoli
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Re: P223bel = COMET 213P-B/VAN NESS
Hi Adrien,
As far as I know, in addition to the main one, we only have the B component. The problem to be clarified is whether the observations of PCCP - P223bel - are to be referred to 213P or 213P-B.
Given the small arc of P223bel and the similarity of the orbits, both possibilities remain open. My choice fell on 213P-B only because, from a quick calculation, the observations of the latter fit better.
In any case a more in-depth analysis? surely will be able to solve the problem.
?
Regards
Piero Sicoli
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Re: P223bel = COMET 213P-B/VAN NESS
Hi Piero,
Great!
Sorry for my na?ve question, I don't know the whole story behind 213P. I see in JPL's SBDB that there is 213P and 213P-B -- i.e. the latter would be a piece of the former, but I don't see any 213P-A. Is the 213P here implicitly the 213P-A? And therefore, is there a second piece waiting to be recovered?
Adrien
Le sam. 7 d¨¦c. 2024, 17:20, Sormano Astronomical Observatory via <obs2.sormano= [email protected]> a ¨¦crit?:
Hi all,
Last night G. Ventre at Sormano2 (L06) obtained images of P223bel now in PCCP.
The calculation of its orbit indicates to me the recovery of the comet 213P-B/VAN NESS.
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Piero Sicoli
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P223bel = COMET 213P-B/VAN NESS
Hi all,
Last night G. Ventre at Sormano2 (L06) obtained images of P223bel now in PCCP.
The calculation of its orbit indicates to me the recovery of the comet 213P-B/VAN NESS.
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Piero Sicoli
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Hi Mike,, yes, after I sent the post I looked at path in SKYMAP and I realised 333P is moving at 4 degrees per day! So only those who read my message immediately would have stood a chance. I only got 1 frame (2- seconds exposure on my C11 @ f/4.7) with a Canon DSLR at ISO25,600 which I only used for centering comets before longer exposures.? It's got Mizar and Alcor at one end of the frame and the comet as a tiny smudge with a bit of tail like your shot has but it not worth publishing - think it was a 2-second exposure.? Then clouds rolled in! It was just dumb-luck that I spotted it :) David Editor,Astronomy Ireland magazine
On Friday 6 December 2024 at 20:27:42 GMT, Mike Olason via groups.io <molason@...> wrote:
David, it was cloudy last night here in the desert and with 333P moving almost 10'/hour across our skies I wonder if Mizar would have still been in my comet FOV by the time it rose in the desert. 333P on the morning of 2024 December 5 0935UT was magnitude G=10.7 as calculated from 4x10 second images taken thru a green filter in an aperture diameter of 2.4'. The comet has brightened 0.5 magnitudes in the last 4 days so it may reach magnitude 10 by December 9 when it makes its close approach to Earth at about 80.8 million kilometers. The comet was 83.6 million kilometers from Earth when these images were collected.
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David, it was cloudy last night here in the desert and with 333P moving almost 10'/hour across our skies I wonder if Mizar would have still been in my comet FOV by the time it rose in the desert. 333P on the morning of 2024 December 5 0935UT was magnitude G=10.7 as calculated from 4x10 second images taken thru a green filter in an aperture diameter of 2.4'. The comet has brightened 0.5 magnitudes in the last 4 days so it may reach magnitude 10 by December 9 when it makes its close approach to Earth at about 80.8 million kilometers. The comet was 83.6 million kilometers from Earth when these images were collected.
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Re: FW: [29P-ml] New intense outburst of 29P today (2024 November 21)
A few weeks after your reported outburst, 29P on the morning of 2024 December 5 0947UT was magnitude G=11.4 as calculated from 60x10 second images taken thru a green filter in an aperture diameter of 2.4', which includes the coma-tail complex. If one looks at the brighter part of the coma, aperture diameter of 1', the magnitude is G=12.3.
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And just one more thing... we here at SWAN are also in a fair competition not only with NEO surveys but with night-sky comet hunters that usually observe regions with low solar elongation. So time is a factor in this game.
Vladimir.
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K. Ly
David Moore(Ireland)
Mike Olason
