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Re: Unusual brightening of comet C/2023 Q1


 

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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)

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Which does suggest that the brightness seen in December is unexpected.

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I won¡¯t start putting the TA column for the next issue together until around January 4.

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Regards,

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Jonathan Shanklin

BAA Comet Section visual observations co-ordinator

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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

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You don't often get email from petercarson100@....

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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.

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All the best

Peter

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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?????

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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

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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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