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Hi Thomas, I imaged this comet last night 20241126_27. I used the MPC ephemeris in Astrometrica to measure with. My astrometry as submitted to MPC last night is attached. I hope this helps. Best

Hi Thomas, The ephemeris provided via the MPC includes: "Perturbed ephemeris below is based on elements from MPEC 2020-L06." so it is not surprising that the ephemeris is out compared to JPL. The MPC

I am currently doing some work on older images and noticed a large difference in coordinates of 333P between MPC and JPL. While the latter are very close to the position of the comet in the image the

Hi Adrien and all! There's the beautiful Theory of Probability playing amazing tricks here and there! The initial assumption of Adrien's calculation was as follows:

All, these might be interesting to read: L. Kresak: A Strange Anomaly in the Occurence Rate of Old Comets https://ui.adsabs.harvard.edu/abs/1981BAICz..32..147K/abstract l. Kresak: On the Reality and

Hi All. Just for information. Recent moderate bright comet 333P/LINEAR now is visible in the last SWAN images with X-Y position (0,0 - upper left): 25/11 342-239. Brightness in the level of +12m based

After looking a bit deeper, I found this paper which identified the relevant comet cluster, although it doesn't identify an obvious candidate stellar flyby:

Hi Qicheng, HD 7977 is the only (currently known) star that might have produced currently-observable influence on the Oort Cloud during its approach to 30,200 +6600 -4900 AU, 2.76 million years ago.

To follow up about the prospects for comet 2024 G3 ATLAS, I made the same kind of tail simulations as for comet Tsuchinshan-ATLAS. Besides what has already been said about the unfavorable viewing

First, a few minor notes that probably don't change the overall problem but matter if you want to calculate a proper expectation value: 1. The difference between any two sets of node/peri can't be

Hi Maik, Thank you, interesting. Adrien [email protected]> a écrit :

Hello Adrien, But it i

Hi all, My question may be stupid, but I have found a few pairs of quasi-parabolic comets with nearly exactly the same angles (i, peri, node), the main difference being their perihelion distance. If,

If Comet C/2023 A3 (Tsuchinshan-ATLAS) had actually been magnitude -3 as seen from "Earth" on October 10 it would have been very easy to see given that the comet set well after the Sun set, it would

Hello all Is it possible, that the comet could observe at the daylight, if it survives? Greetings Anja Verh?fen Alexander Balashov via groups.io <skywatcher422@...> schrieb am Mo.,

Coma c/2024 g3 is likely to be more condensed than coma c/2023 a3, because c/2024 g3 will be further from Earth and mag -3 will be reached by close approach to the Sun rather than by forward

Can we predict the (non-)visibility of C/2024 G3 around peak brightness in strong twilight from the recent experience with C/2023 A3's around its solar conjunction? The following assumes a) that G3

Hi David, I routinely image comets brighter than magnitude 15 that are visible from Tucson, Arizona to calculate the magnitudes of these comets. I started imaging 37P and C/2023 C2 in early September

Very nice work Mike! Where did you discover this conjunction may I ask? Running JPLHorizons I find the time of closest approach (GEOCENTRIC) was 5.64 arcseconds on Nov.19d 23:32UT ( I think parallax

Astrometrica software used several hundred stars in the FOV to determine that my old eyes using only a few stars did not do a very good job of estimating the comets magnitude in the animation above.