Comet C/2021 P4 (ATLAS)

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Observation date	image	Photometry (FOCAS)	Afρ	astrometry	Observatory
20210813	X			X	B96 - BRIXIIS
20211108	X	X		X	B96 - BRIXIIS
20211122	X	X		X	B96 - BRIXIIS

COMET C/2021 P4 (ATLAS)

Photometric data obtained from FOCAS-II software

COD X02

OBS BRIXIIS Observatory

CATALOG: Gaia DR2 - BAND: G

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

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

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

C/2021 P4 08/11/2021 19:24:26 17.71 17.52 17.57 7.2 17.6 B96

C/2021 P4 08/11/2021 19:24:26* 0.15 0.29 0.24 3 4.0 Gai

C/2021 P4 22/11/2021 17:36:00 17.05 16.75 16.43 16.04 15.80 15.54 8.2 18.2 B96

C/2021 P4 22/11/2021 17:36:00* 0.25 0.35 0.38 0.43 0.40 0.38 2 3.9 Gai

AFRHO LOG

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

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

C/2021 P4 08/11/2021 19:24:26 3.16 3.73 8.74 17.70 7 110 15 2.043 B96

C/2021 P4 22/11/2021 17:36:00 3.08 3.58 8.95 17.29 8 142 17 2.152 B96

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

http://cara.uai.it

Comet C/2021 P4 (ATLAS) (astro.vanbuitenen.nl)

Discovery:

MPEC N137: COMET P/2021 N2 (Fuls)

L. Sannino and G. Scarfi report cometary activity in an asteroidal NEOCP candidate first observed by ATLAS-HKO (T05) on Aug. 10 UT. They report a very condensed 3" coma in images taken at iota Scorpii Observatory (K78) on Aug. 11.

Additional reports of cometary features are as follows:

OC Date Reporter Coma Tail PA Exposures

G40 2021-08-14 N. Paul 13" 21x50s

204 2021-08-14 A. Aletti 5"

F65 2021-08-17 J. D. Armstrong 4" 10" 230

K78 2021-08-18 L. Sannino 3" 70x30s