Comet C/2021 Q3 (ATLAS)

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Observation date	image	Photometry (FOCAS)	Afρ	astrometry	Observatory
20210829	X			X	Z08 - Telescope.Live
20210907	X			X	B96 - BRIXIIS
20211027	X	X			X

COMET C/2021 Q3 (ATLAS)

Photometric data obtained from FOCAS-II software

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

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

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

C/2021 Q3 27/10/2021 21:55:44 18.55 18.11 18.20 3.0 17.7 B96

C/2021 Q3 27/10/2021 21:55:44* 0.13 0.11 0.10 3 3.7 Gai

AFRHO LOG

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

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

C/2021 Q3 27/10/2021 21:55:44 5.15 5.25 5.35 18.72 3 229 76 2.359 B96

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

http://cara.uai.it

Comet C/2021 Q3 (ATLAS) (astro.vanbuitenen.nl)

Discovery:

MPEC 2021-Q97: COMET C/2021 Q3 (ATLAS)

R. Weryk reports cometary activity in an asteroidal NEOCP candidate first observed by ATLAS-HKO (T05) on Aug. 26 UT. He reports a diffuse 0".7 coma in four 45-second i-band survey images and PSF asymmetry suggesting a tail East obtained on Aug. 27 at Pan-STARRS 1 (F51). He also reported prediscovery astrometry taken on Aug. 19 from Pan-STARRS 1 (F51). Additional reports of cometary features are as follows:

OC Date Reporter Coma Tail PA Exposures

204 2021-08-26 A. Aletti 7" 10" 95

Z31 2021-08-26 R. Reszelewski 3".5

G18 2021-08-29 A. Valvasori 7".4 24x120s

H06 2021-08-29 H. Sato 10" 6" 90 10x60s

Z08 2021-08-29 E. Bryssinck 7" 36x60s

G40 2021-08-29 B. Lutkenhoner 7" 21x50s