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Statistically speaking, a small percent of the low and high magnitude estimates should be thrown out and what one has left is usually the comets magnitude within the error of our visual or electronic

Dear all, @Peter, Alan, Michael: Thanks for your effort in detecting and confirming the faint extended coma. @Jakub: Thank you for appreciating my work. I'd like to share my latest results:

Dear All, My observation of C/2023 Q1 PANSTARRS: https://www.astronomie.be/pieterjan.dekelver/Observations/2024/20241228_1749_CK23Q010_M09_FINAL.jpg I could not see any dense coma, but the sky was

Dear Co-Observers, NEW OBSERVATIONS – 2024-12-28 Unexpectedly i had a fairly clear / faint fog evening of 28 December before heavy fog ruined the night again. 12-28 22h50m C/2024 M1 ATLAS

thanks a lot for the detailed explanation Qicheng! Nicolas [email protected]> a écrit :

TESS is not good for precision astrometry, because it has 21 arcsec pixels and the PSF is highly undersampled. ?So even measurements to sub-pixel accuracy only get positions down to a few arcsec. As

Hello Juan and all, I would quote your statement: "My visual observation of C/2023 Q1 was not a highly difficult one. I made a clear detection of the very diffuse outer coma." I would like to clarify

My estimate of the dynamical age is based on the (inbound) semi-major axis, which is ~4000 au for this comet. Comets with such a semi-major axis of a few thousand au can often become gravitationally

Hi Qicheng, hi all, i am curious about which information can tell that the comat has "a dynamical age on the order of only ~1 orbit" ? I thought the orbit analysis could only tell the previous

Denis, Jakub, Bob, friends, As told previously, I am tired after three consecutive nights ( Dec. 26, 27, 28 ) observing comets from the snowy Cantabrian Mountains. So this will be a short reply ...

Denis, Hoping for clear skies soon. I'll report back. Thanks, Bob <buczynski8166@...> wrote:

Bob, It will be intersting to see your report when you are able to observe then comet. JJ was observing from a high altitude mountain site and it exceptional that he has been able to observe this

Peter, That was absolutely brilliant. What a great sleuthing method! Bob [email protected]> wrote:

Jakub and all, This discussion has inspired me to observe C/2023 Q1 in my 38-cm reflector at the next opportunity. I also have a very dark sky especially in the north direction — when the aurora

Hi Bill, This occasionally happens with Astrometrica, often occurring when an image is included in a stack by mistake with e.g. a bright artificial satellite crossing the field, throwing the software

On 12/29/24 10:39, Peter Birtwhistle via groups.io wrote:> I think the stacking may have registered a frame incorrectly causing a Interesting. I wonder how often such things happen? Often enough that

Hello all, If I have read the posts correctly, we have two observations: 1. CCD magnitude of 14.1 mag with a 5' aperture. 2. Visual magnitude of 11.6 mag with a 6' aperture. How can we explain such a

Hi again JJ. Thanks for your reply, always courteous and friendy. Some of what you write I agree with, some aspects are more contentious. However you previously mentioned you had spoken you last words

Denis, You deserve a good reply ... - Quoting your words : " My imaging may not have not recorded a very faint outer coma , but in the overall description of the condition of this comet I would say

Hi all, Last night I observed again from Frasso Sabino (Observatory 157, Rieti, Italy) the "comet" 2015CD60 and it has not only increased in brightness, compared to December 2nd when I realized it was