Looks like it has been fixed already, as coordinates are now correct (refering
to MPEC 2024-VJ2 now).
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Am Wed, 27 Nov 2024 14:38:59 -0700
schrieb "Alan Hale" <ahale@...>:
Dear Thomas, all,
If you haven¡¯t already, you should submit a Jira ticket on this issue.
I¡¯ve noticed on a couple of previous occasions that the MPC Ephemeris Service seems to have an issue with this particular comet every time a new batch of the MPCs are prepared. On those occasions ¨C and it seems to have happened again ¨C the Service stripped the leading ¡°1¡± from the inclination (i.e., an inclination of 32 degrees vs. 132 degrees) from the orbital elements, and the the computed ephemeris positions are accordingly far off.
Sincerely,
Alan
Peter, Denis,
thank you for your remarks on this issue.
It is indeed strange that MPES is using such old data. FYI I had downloaded
an elements file from MPC about 4 weeks ago and there the reference was MPEC
2024-U18 - much better in line with current observations.
Best regards
Thomas
Am Wed, 27 Nov 2024 18:48:53 +0000 (GMT)
schrieb "Denis Buczynski via groups.io" <buczynski8166@...>:
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 wishes
Denis Buczynski
BAA Comet Section
333P| | | | CCD|I81
|2024-11-27T02:29:15Z |179.02611 |+31.70159 |0.11 |0.10 |
Gaia2|14.2 |0.02 | G| Gaia2| 9.9 |2.29 |4.2 | 270|0.14 |
34|K |
333P| | | | CCD|I81
|2024-11-27T02:34:03Z |179.03085 |+31.70860 |0.10 |0.08 |
Gaia2|14.2 |0.02 | G| Gaia2| 9.9 |2.30 |3.8 | 270|0.12 |
36|K |
333P| | | | CCD|I81
|2024-11-27T02:38:52Z |179.03512 |+31.71530 |0.08 |0.09 |
Gaia2|14.2 |0.02 | G| Gaia2| 9.9 |2.28 |3.8 | 270|0.12 |
31|K |
------ Original Message ------
From: t.lehmann@...
To: [email protected]
Cc: mrudenko@...
Sent: Wednesday, November 27th 2024, 18:34
Subject: [comets-ml] 333P - MPC coordinates far off
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 former are off by almost 1
degree.
In addition to the wrong position the web form
does return a completely wrong motion vector as well.
Could anybody check this?
Thanks
Thomas
