Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75

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Possible 12P outburst on or before Nov 14.75 Nick James (15 Nov 2023 06:52 UTC)

RE: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Andrew Robertson (15 Nov 2023 07:05 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Nick James (15 Nov 2023 07:51 UTC)

Possible 12P outburst on or before Nov 14.75 Peter Carson (15 Nov 2023 09:51 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Richard Miles (15 Nov 2023 10:38 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Nick James (15 Nov 2023 17:25 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Helen Usher (15 Nov 2023 17:41 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Nick James (15 Nov 2023 17:59 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Paul Abel (15 Nov 2023 18:09 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Nick James (15 Nov 2023 18:39 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Paul Abel (15 Nov 2023 19:05 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Dr. Tony Phillips (15 Nov 2023 19:56 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Richard Miles (15 Nov 2023 20:08 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Nick James (15 Nov 2023 20:38 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Nick James (26 Nov 2023 12:40 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 denis buczynski (15 Nov 2023 18:41 UTC)

Re: [BAA Comets] Possible 12P outburst on or before Nov 14.75 Nick James 15 Nov 2023 17:59 UTC

Helen,

Thanks. It is pretty exciting for us old-timers too!

The comet is currently 2.77 au from Earth so 1 arcsec corresponds to
2,000km. The new coma has expanded to 34 arcsec diameter in a day which
implies an expansion velocity of 390 m/s. This is a lot faster than the
previous outbursts unless I've got my maths badly wrong...

Nick.

On 15/11/2023 17:41, Helen Usher - helen.usher at yahoo.co.uk (via
baa-comet list) wrote:
>   Yes QuickLOOK on LCO images giving rp measured with a 5" radius aperture using the PS1 magnitude system as 9.6 now against 14.6 on Monday.  Really looking forward to the excitement of our school children monitoring this again!