Comet C/2021 T4 (LEMMON)

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Observation date	image	Photometry (FOCAS)	Afρ	astrometry	Observatory
20211011	X			X	X02 - Telescope.Live
20221125	X	X	X	X	B96 - BRIXIIS
20221212	X	X	X	X	B96 - BRIXIIS

COMET C/2021 T4 (LEMMON)

Photometric data obtained from FOCAS-II software

CATALOG: Gaia DR2 - BAND: G

10x10 20x20 30x30 40x40 50x50 60x60 SNR SB COD

COMET UTC +/- +/- +/- +/- +/- +/- N FWHM CAT

------------ ------------------- ----- ----- ----- ----- ----- ----- ---- ---- ---

C/2021 T4 25/11/2022 21:14:49 16.20 15.64 15.41 15.22 15.14 15.05 13.0 17.4 B96

C/2021 T4 25/11/2022 21:14:49* 0.08 0.12 0.14 0.15 0.13 0.10 2 3.7 Gai

C/2021 T4 12/12/2022 18:41:38 16.17 15.61 15.37 15.24 15.15 15.04 10.4 17.1 B96

C/2021 T4 12/12/2022 18:41:38* 0.00 0.00 0.00 0.00 0.00 0.00 1 3.9 Gai

AFRHO LOG

COMET UTC DELTA r BOX " MAG RSR CM +/- AFRHO OBS

------------ ------------------- ----- ----- ----- ----- --- ----- ---- ----- ---

C/2021 T4 25/11/2022 21:14:49 2.75 3.46 10.02 16.14 13 304 23 2.483 B96

C/2021 T4 12/12/2022 18:41:38 2.87 3.29 9.61 16.13 10 303 29 2.481 B96

Af(rho) data according the CARA-approach is available via request to CARA-coordinator

http://cara.uai.it

Comet C/2021 T4 (LEMMON) (astro.vanbuitenen.nl)

Discovery: [ CBET 5063 ]

E. Bryssinck reports cometary activity of an asteroidal NEOCP candidate (submitted by Mount Lemmon Survey on Oct. 7 UT) in twelve 120-second images taken on Oct. 11 at Telescope Live (X02), noting a condensed 9" coma elongated in position angle 321 deg. Prediscovery astrometry was reported back to Aug. 2021. Additional reports of cometary features are as follows:

OC Date Reporter Coma Tail PA Exposures

204 2021-10-15 L. Buzzi 4".8

157 2021-10-16 R. Haver 6" 40x90s

F51 2021-10-27 R. Weryk 0".6 2" 70-115 2x45s

246 2021-10-28 M. Tichy 8".0

MPEC 2021-U187 : COMET C/2021 T4 (Lemmon)