I was about to reply that this is C/2022 S4 (Lemmon) which is several magnitudes too faint (close to magnitude 20) but passes over the exact same part of sky (down to the arcsecond) just a few days later. I was used to TESS comet discoveries overestimating the magnitudes by several levels and so was surprisingly ready to believe that a 20th magnitude comet would look like this.
~Sam
On Sunday, December 29, 2024 at 04:33:07 AM EST, Maik Meyer <maik@...> wrote:
Hello Christophe,
this is P/2022 L3 (ATLAS).
Magnitude fits nicely.
You may use
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 ________________________________________________________________________
