On 12/29/24 04:33, Maik Meyer wrote:> You may use
With the minor note that, because this is a spacecraft-based observation, you'll have to tell MPC where the spacecraft was at the time of the observation. This tool may simplify that task :
(Though if you're just looking for an identification, you can probably get away with lying and saying that it was a geocentric observation. Apogee is only about at the distance of the moon.)
The TESS observations I've seen tend to be oddly bad in the astrometry; several-arcsecond mean errors are normal. And recently, my Sat_ID tool logged errors for TESS observations that made me wonder if there might be timing issues as well :
As noted there, the astrometric error issues may just be due to these being wide-field images and needing better correction than your average image. In any case... I've yet to see really good astrometry come from TESS. (Photometry, at least after going through the 'official' TESS pipeline, is presumably lovely stuff, or they wouldn't be finding exoplanets with it. Though that's the stellar photometry; photometry of fuzzy or moving objects may not be so great.)
-- Bill
Regards
Maik
I was performing some photometry on a variable star (Hip10272, in Aries) in some TICA TESScuts, sector 58, when I came upon a quite nice comet slowly crossing the FOV, in a corner of the images.
I did a quick search using Patrick Chevalley's CdC, but could not find any valuable comet candidate to match this beauty.
This comet had a condensed head, about 60'', and maybe a 15' tail, all in all.
I did a photometry in a 1.5 pixel around the centroid of the coma, and get a mean value of 15.32 mag on 74 sub images, so in a 30'' circle, using AIJ. This coma magnitude is in pseudo V, or CV. The mag of the comps stars were in V, but I've some doubts about the original bandpass of the TESS data.
I managed to found a FOV where the comet is traveling dead in the center of the images, and releved an (approximative) astrometric position when the comet just crossed the right center of the FOV, unfortunatelly in front of a mag 13 star.
slice/date (BJD)/ RA/ DEC
7276 2459899.584 021203.4 +234004.3
The TICA sector 58 can be downloaded from here :
<>
If you enter the position 33.133098 23.671662, you'll download the same FOV than mine.
Here are a few images.
Any advice on how to find the name of this comet is welcome.
Thanx in advance.--
"One cannot discover comets lying in bed." * Lewis Swift
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