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I just got back from observing C/2024 G3 from a nearby bayside location in Brisbane.? This comet has been very elusive visually in 50mm binoculars due to its low elevation in twilight, but this

Alan, "A significant factor in my decision to “semi-retire” lies in the fact that I’ve been hanging around longer and longer, and age, unfortunately, is starting to take its toll ... ...that I

[re-send . . . I proofread this several times before sending . . . and still . . . ] Dear all, Many of you may remember that, a little over three years ago, I announced that I was “semi-retiring”

Dear all, Many of you may remember that, a little over three years ago, I announced that I was “semi-retiring” from visual comet observing, At that time I wasn’t entirely sure what I meant by

(Raises hand) I gotta admit, I'm currently the bottleneck. There has been quite a bit of back-and-forth between me, Karl, MPC, Dan Green, and a few others on this. We've actually made a decent bit of

Ok, thank you for these explanations. Adrien [email protected]> a écrit :

Maik is entirely correct here. Producing orbits for SOHO (STEREO, PSP...) comets is easy. Producing orbits that are *realistic* is absolutely NOT easy. Anyone can test this by placing short-arc SOHO

Adrein, my experience is that with these extremely short arcs you'll often need manual interefence to make the solution converge. For instance you would fix e to 1 but also i to e.g. 142° for the

For the measurements, sure somebody has to do it (it is certainly more complex than the more usual ground-based asteroid or even comet observations), but for orbit determination, if there are enough

It is my understanding that a very large number is ready to be announced. I do not know where the bottleneck is, maybe Bill Gray or Karl Battams are able to enlighten us. In the end you need to

Hi, Please people correct me if I'm wrong, but I think that the MPC initially decided to designate only the comets with a large enough number of observations for the orbit to be constrained well

Why don't do SOHO comets receive MPC names after 2010? (C/YYYY {letter}{number})

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