Re: Unusual brightening of comet C/2023 Q1
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Hi Alan,
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Thanks for the contribution and the images which tell a significant story in this "debate". Your image of C/2023Q1 is similar to mine, as is the magnitude. Your outburst image of 29p which shows a 5.5 ' coma, is exactly what would be expected for a comet that was 11.6 with a 6' coma as JJ Gonzalez has reported that C/2023Q1 currently is . From the evidence to date, at least to my mind, C/2023Q1 is around magnitude 15.3 and has a small coma of 30". Denis Buczynski BAA Comet Section ------ Original Message ------
From: ahale@... To: [email protected] Sent: Saturday, December 28th 2024, 04:39 Subject: Re: [comets-ml] Unusual brightening of comet C/2023 Q1 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 ¨C 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. 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Denis Buczynski