comet C/2019 Y1 (ATLAS)

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Observation date	image	Photometry (FOCAS)	Afρ	astrometry	Observatory
20191222	X			X	Telescope Live, Chile
20191223	X			X	G39 , ROAD- Chile
20200418	X	X	X	X	B96 - BRIXIIS
20200419	X	X	X	X	B96 - BRIXIIS
20200420	X	X	X	X	B96 - BRIXIIS
20200421	X	X	X	X	B96 - BRIXIIS
20200422	X	X	X	X	B96 - BRIXIIS
20200423	X	X	X	X	B96 - BRIXIIS
20200424	X	X	X	X	B96 - BRIXIIS
20200425	X	X	X	X	B96 - BRIXIIS
20200426	X	X	X	X	B96 - BRIXIIS
20200501	X	X	X	X	B96 - BRIXIIS
20200502	X	X	X	X	B96 - BRIXIIS
20200504	X	X	X	X	B96 - BRIXIIS
20200505	X	X	X	X	B96 - BRIXIIS
20200506	X	X	X	X	B96 - BRIXIIS
20200511	X	X	X	X	B96 - BRIXIIS
20200512	X	X	X	X	B96 - BRIXIIS
20200513	X	X	X	X	B96 - BRIXIIS
20200514	X	X	X	X	B96 - BRIXIIS
20200527	X	X	X	X	B96 - BRIXIIS
20200529	X	X	X	X	B96 - BRIXIIS
20200611	X	X	X	X	B96 - BRIXIIS

Comet C/2019 Y1 (ATLAS)

Photometric data obtained from FOCAS-II software

COD B96

CON E. Bryssinck, Eyckensbeekstraat 2, 9150 Kruibeke

CATALOG: USNO A2.0 / CMC 14-15 - BAND: R

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

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

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

C/2019 Y1 19/04/2020 20:32:18 12.63 11.63 11.10 10.75 10.49 10.29 25.2 17.0 B96

C/2019 Y1 19/04/2020 20:32:18* 0.02 0.03 0.03 0.03 0.03 0.03 23 3.6 Gai

C/2019 Y1 20/04/2020 20:46:45 12.72 11.70 11.16 10.79 10.53 10.32 17.1 17.3 B96

C/2019 Y1 20/04/2020 20:46:45* 0.02 0.02 0.01 0.00 0.01 0.01 2 3.8 Gai

C/2019 Y1 22/04/2020 20:44:03 12.77 11.74 11.18 10.81 10.54 10.33 29.4 17.4 B96

C/2019 Y1 22/04/2020 20:44:03* 0.01 0.01 0.01 0.01 0.01 0.01 3 3.7 Gai

C/2019 Y1 23/04/2020 20:45:44 12.80 11.79 11.24 10.88 10.62 10.41 32.3 16.8 B96

C/2019 Y1 23/04/2020 20:45:44* 0.01 0.01 0.01 0.01 0.00 0.01 3 3.2 Gai

C/2019 Y1 24/04/2020 20:41:57 12.78 11.78 11.24 10.87 10.60 10.39 37.2 17.7 B96

C/2019 Y1 24/04/2020 20:41:57* 0.01 0.01 0.01 0.01 0.01 0.01 15 2.8 Gai

C/2019 Y1 25/04/2020 20:39:41 13.01 12.02 11.49 11.13 10.87 10.67 30.1 17.4 B96

C/2019 Y1 25/04/2020 20:39:41* 0.00 0.00 0.00 0.01 0.01 0.01 4 3.2 Gai

C/2019 Y1 26/04/2020 20:40:00 13.29 12.25 11.73 11.38 11.12 10.90 25.6 17.2 B96

C/2019 Y1 26/04/2020 20:40:00* 0.01 0.00 0.01 0.02 0.02 0.01 3 3.0 Gai

C/2019 Y1 01/05/2020 21:37:57 13.78 12.72 12.19 11.84 11.55 11.35 14.5 17.0 B96

C/2019 Y1 01/05/2020 21:37:57* 0.02 0.02 0.03 0.03 0.03 0.02 2 3.8 Gai

C/2019 Y1 02/05/2020 21:41:09 13.88 12.81 12.25 11.88 11.60 11.39 21.4 17.7 B96

C/2019 Y1 02/05/2020 21:41:09* 0.01 0.02 0.02 0.02 0.02 0.02 3 2.9 Gai

C/2019 Y1 04/05/2020 21:34:25 14.13 13.07 12.52 12.15 11.86 11.64 18.1 17.6 B96

C/2019 Y1 04/05/2020 21:34:25* 0.01 0.03 0.04 0.04 0.03 0.03 13 3.3 Gai

C/2019 Y1 05/05/2020 22:18:17 14.15 13.09 12.54 12.17 11.89 11.67 17.3 17.7 B96

C/2019 Y1 05/05/2020 22:18:17* 0.02 0.03 0.04 0.04 0.04 0.04 14 3.8 Gai

C/2019 Y1 11/05/2020 21:39:26 14.74 13.66 13.10 12.72 12.43 12.19 16.8 18.4 B96

C/2019 Y1 11/05/2020 21:39:26* 0.02 0.04 0.04 0.04 0.03 0.02 12 3.0 Gai

C/2019 Y1 13/05/2020 21:35:58 14.95 13.87 13.31 12.93 12.64 12.40 13.4 18.4 B96

C/2019 Y1 13/05/2020 21:35:58* 0.03 0.04 0.04 0.03 0.03 0.03 4 3.6 Gai

C/2019 Y1 14/05/2020 21:41:50 14.83 13.87 13.35 12.98 12.69 12.47 13.3 18.4 B96

C/2019 Y1 14/05/2020 21:41:50* 0.42 0.22 0.14 0.10 0.09 0.08 3 3.7 Gai

C/2019 Y1 27/05/2020 21:44:56 16.32 15.25 14.62 14.19 13.88 13.64 5.0 18.2 B96

C/2019 Y1 27/05/2020 21:44:56* 0.05 0.06 0.08 0.06 0.06 0.05 4 3.2 Gai

C/2019 Y1 29/05/2020 21:55:24 16.50 15.42 14.76 14.32 14.01 13.76 6.1 18.0 B96

C/2019 Y1 29/05/2020 21:55:24* 0.05 0.03 0.02 0.02 0.02 0.02 5 3.2 Gai

AFRHO LOG

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

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

C/2019 Y1 19/04/2020 20:32:18 1.13 1.05 24.33 11.42 25 371 15 2.569 B96

C/2019 Y1 20/04/2020 20:46:45 1.13 1.06 24.47 11.47 17 356 21 2.552 B96

C/2019 Y1 21/04/2020 20:29:03 1.12 1.08 24.60 11.64 23 308 13 2.488 B96

C/2019 Y1 22/04/2020 20:44:03 1.12 1.09 24.72 11.49 29 358 12 2.554 B96

C/2019 Y1 23/04/2020 20:45:44 1.11 1.10 24.83 11.54 32 346 11 2.539 B96

C/2019 Y1 25/04/2020 20:39:41 1.10 1.12 25.03 11.77 30 288 10 2.460 B96

C/2019 Y1 26/04/2020 20:40:00 1.10 1.13 25.12 12.01 26 233 9 2.368 B96

C/2019 Y1 24/04/2020 20:41:57 1.11 1.11 24.94 11.52 37 357 10 2.552 B96

C/2019 Y1 01/05/2020 21:37:57 1.09 1.19 25.35 12.46 15 167 12 2.224 B96

C/2019 Y1 02/05/2020 21:41:09 1.09 1.21 25.36 12.53 21 160 7 2.205 B96

C/2019 Y1 04/05/2020 21:34:25 1.11 1.23 24.91 12.82 18 134 7 2.127 B96

C/2019 Y1 05/05/2020 22:18:17 1.11 1.25 24.87 12.84 17 134 8 2.128 B96

C/2019 Y1 11/05/2020 21:39:26 1.13 1.32 24.37 13.43 17 91 5 1.960 B96

C/2019 Y1 13/05/2020 21:35:58 1.14 1.35 24.10 13.66 13 79 6 1.896 B96

C/2019 Y1 14/05/2020 21:41:50 1.15 1.36 23.95 13.66 13 81 6 1.910 B96

C/2019 Y1 27/05/2020 21:44:56 1.30 1.53 21.22 15.17 5 33 7 1.513 B96

C/2019 Y1 29/05/2020 21:55:24 1.33 1.56 20.73 15.36 6 30 5 1.471 B96

FoCAs 3.66

www.astrosurf.com/cometas-obs

es.groups.yahoo.com/group/Cometas_Obs

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

http://cara.uai.it

M.P.E.C. 2020-A72 Issued 2020 January 5, 21:29 UT

COMET C/2019 Y1 (ATLAS)

This object was reported on 2019 Dec. 16 UT as a possible comet by J. Robinson on behalf of the ATLAS-HKO survey (T05), noting a 20" condensed elongated coma (PA 80) without a tail. Additional reports of cometary features are as follows:

OC Date Reporter Coma Tail PA Exposures

807 Dec. 17 T. Linder 6" 2" 180

Q62 Dec. 17 H. Sato 45" 10x60s

W88 Dec. 21 B. Ltkenhner 12"

W76 Dec. 22 E. Bryssinck 36" 27" 78 20x60s

G39 Dec. 23 E. Bryssinck 1' 30x60s

J04 Dec. 23 M. Micheli 30"

Q62 Dec. 25 K. Yoshimoto 1'.4

349 Dec. 28 K. Kadota 1'.5

Q62 Dec. 30 H. Sato 1'.5 8x60s

X74 Dec. 31 L. S. Amaral 27" 3x60s

204 Jan. 04 L. Buzzi 12" 90x20s