Visibility I / V
Comet C/2021 Y1 (ATLAS) in a nearly parabolic orbit was imaged on the first night of the 2022 November talcos. The comet was discovered by the ATLAS-MLO observatory (T08 – ATLAS-MLO) of the Asteroid Terrestrial- Impact Last Alert System" (ATLAS) search program, Mauna Loa with a 50cm telescope on June 26, 2021. The comet's perihelion is April 30, 2023. When photographing the comet, it was 1.8189au away, at its closest was 1.688au on December 12, 2022. The comet will be at its brightest from November 2022 to June 2023, estimated at 12.5-14 mag. After the turn of the year, the comet will move away to the southern hemisphere.
1Fig. stacked 1-11 images L120s sum image according to stars, fast movement is visible. Asteroid (5951) Alicemonet 14.986mag, movement is visible. Asteroid (23968) 1998 XA13, motion visible. Asteroid (7763) Crabeels 17.261mag , motion visible . Asteroid (363113) 2000 XU1 19.204mag, motion visible. Asteroid (171158) 2005 GN110 19.396mag, motion visible. Asteroid 2015 XY366 19.520mag, motion not visible. Asteroid (269621) 2010 UX96 19.475mag, motion visible. There are no asteroids below 20.0 mag in the picture. Brightness measured with Astrometrica program 14.5mag.
2Fig. Stacked L120s sum image of images 1-11 by comet.
3Fig. Same stack MaximDL Histogram Specification with Rayleigh stretching. Tail 121" (2') and comma 23".
4Fig. first image measured, 2022-11-18T 21:21:25UT 2459902.38987JDUT 04h38m29.36s +17d19'47.8" N14.923mag Std Dev 469.143 SNR136.988 FWHM5.683" ,JPL Horizon 21:21:25mUT 07d19'47.8s '49.0" T15.201mag .
5Fig. last image measured, 2022-11-18 21:42:04UT 2459902.40421JDUT 04h38m28.02s +17d19'25.4" N15.052mag Std Dev 326.109 SNR160.457 FWHM7.717" ,JPL Horizon 21:42:04mUT28.9d17.07s +17d19'25.4" '25.6" T12.824mag .
TYC 1270-1000-1 11.63mag star used for brightness measurement calibration.
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