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Mike - you are right that there's no clear objective dividing line between 'comet' and 'asteroid', and that the current definition is somewhat arbitrary, but this is still the definition we are

IMHO The level of activity is the important factor for the asteroid orbit study. If it is an object with so low activity that doesn’t affect observations is not a comet-like object. With no outburst

If one wants to be honest about what happens to any object with basically no atmosphere that gets close enough to the Sun to heat up its surface, they are all comets according to our definition of

After checking, just artifact!

Hello Sam , My observations from Nov. 04 and Dec. 12 seem to show to jets in PA 200 and 340° but maybe it is just artefacts : https://lesia.obspm.fr/comets/lib/display-obs1.php?Num=29261

Op 24-12-2024 om 0:12 schreef planetaryscience via groups.io:

Goodmorning, Well, I'm sharing the same thoughts. I've been questioning this myself the first time i observed this object:

Hi all, I wanted to invite some discussion on this topic I've been wondering about for a bit: I don't think C/2024 M1 is actually a comet. C/2024 M1 (ATLAS) was published as a comet back in July, with

CMOS vs. CCD shouldn't matter, nor should "estimated" uncertainty of individual astrometric positions. What should matter is leaving out observations with bad residuals -- something that the MPC

Either type of detector should be capable of measuring positions to a few tenths of a pixel (which will be well below 1" in most cases) with basic centroiding and a good solution to a good reference

Excellent! Very nice with the conjunction. I would like to know when the circular will come out, what are they waiting for? Regards, Roberto Haver 157 Frasso Sabino "Alan Hale"

There should be no astrometric differences between the two types of sensors. I have used both the CCD until a couple of years ago and now a CMOS sensor and I do not see any differences due to the type

I personally don't imagine why CMOS observations must have a different weighting respect to CCD observations. Luca #204 [email protected]> ha scritto:

Hi all, I am currently working on fitting the orbits of some long-period comets based on data obtained from the MPC database. In assigning uncertainties to the data, my orbit fitting program follows

Dear Roberto, all, I was able to obtain a new set of images of this object last night via LCO-Tenerife. Both single and stacked images show a small condensed coma and a distinct, straight tail up to

Hi all, MPEC 2024-Y20 announced yesterday the discovery of the Jupiter-family comet C/2024 X1 (Fazekas). Its nominal orbital period (29.5 years) is surprisingly similar to that of Saturn (29.4 years;

Hi Jakub, 1. It is really the isue with the query looking from the comet center instead of the center of the image. If you have in the settings the option calculated comet pos. ON then the queries

Hello Jure, unfortunately this finds me in a time when I am heavy loaded with work and have no time to examine these things detailed. However answer to 1. question could be different obtaining of

Hi, I'm experiencing some strange behavior with KOPR. I have the stable version 0.83 installed as an compile executable. I also have the live version, which I run from a source with Python 3.10 I have

Hi Vladimir, I've been imaging this comet in the morning twilight using iTelescope T70 in Chile. This is a 135mm Samyang lens but it has the advantage of being able to get to the horizon. As of this