Comet C/2019 L3 (ATLAS)

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Observation date	image	Photometry (FOCAS)	Afρ	astrometry	Observatory
20190622	X			X	B96 - BRIXIIS
20190626	X			X	B96 - BRIXIIS
20190703	X			X	B96 - BRIXIIS
20190723	X	X		X	B96 - BRIXIIS
20190730	X	X		X	B96 - BRIXIIS
20190807	X	X		X	B96 - BRIXIIS
20200623	X	X		X	B96 - BRIXIIS
20200625	X	X		X	B96 - BRIXIIS
20200819	X	X		X	B96 - BRIXIIS
20200905	X	X		X	B96 - BRIXIIS
20200916	X	X		X	B96 - BRIXIIS
20200918	X	X		X	B96 - BRIXIIS
20200920	X	X		X	B96 - BRIXIIS
20200921	X	X		X	B96 - BRIXIIS
20201102	X	X		X	B96 - BRIXIIS
20201104	X	X		X	B96 - BRIXIIS
20201119	X	X		X	B96 - BRIXIIS
20201128	X	X		X	B96 - BRIXIIS
20201204	X	X		X	B96 - BRIXIIS
20210228	X	X		X	B96 - BRIXIIS
20210305	X	X		X	B96 - BRIXIIS
20210325	X	X		X	B96 - BRIXIIS
20220124	X	X	X	X	B96 - BRIXIIS
20220211	X	X	X	X	B96 - BRIXIIS
20220304	X	X	X	X	B96 - BRIXIIS
20220305	X	X	X	X	B96 - BRIXIIS
20220307	X	X	X	X	B96 - BRIXIIS
20220308	X	X	X	X	B96 - BRIXIIS
20220309	X	X	X	X	B96 - BRIXIIS
20220310	X	X	X	X	B96 - BRIXIIS
20220323	X	X	X	X	B96 - BRIXIIS
20220324	X	X	X	X	B96 - BRIXIIS
20220328	X	X	X	X	B96 - BRIXIIS

Comet C/2019 L3 (ATLAS)

Photometric data obtained from FOCAS-II software

COD B96

CON E. Bryssinck, Eyckensbeekstratt 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 L3 03/07/2019 23:02:12 18.41 18.20 18.25 5.7 17.7 B96

C/2019 L3 03/07/2019 23:02:12* 0.25 0.30 0.30 7 3.3 CMC

C/2019 L3 30/07/2019 00:24:16 17.81 17.50 17.59 4.7 18.1 B96

C/2019 L3 30/07/2019 00:24:16* 0.15 0.15 0.15 7 3.8 CMC

C/2019 L3 07/08/2019 23:08:17 18.32 18.24 18.22 6.9 18.4 B96

C/2019 L3 07/08/2019 23:08:17* 0.07 0.17 0.19 4 3.4 CMC

C/2019 L3 23/06/2020 00:38:21 16.63 16.35 16.38 16.43 14.4 17.5 B96

C/2019 L3 23/06/2020 00:38:21* 0.02 0.03 0.10 0.17 2 3.6 Gai

C/2019 L3 25/06/2020 00:40:01 15.88 15.22 14.91 14.67 14.60 14.59 11.2 17.6 B96

C/2019 L3 25/06/2020 00:40:01* 0.00 0.14 0.17 0.09 0.08 0.11 2 3.9 Gai

C/2019 L3 19/08/2020 00:15:46 15.94 15.54 15.38 15.31 15.22 15.20 22.3 18.2 B96

C/2019 L3 19/08/2020 00:15:46* 0.03 0.01 0.03 0.07 0.09 0.12 3 4.0 Gai

C/2019 L3 05/09/2020 21:40:31 15.66 15.25 15.13 15.15 17.9 17.9 B96

C/2019 L3 05/09/2020 21:40:31* 0.02 0.01 0.03 0.08 2 3.9 Gai

C/2019 L3 16/09/2020 22:29:15 15.60 15.11 14.91 14.83 14.90 20.4 17.1 B96

C/2019 L3 16/09/2020 22:29:15* 0.00 0.01 0.07 0.10 0.13 2 3.0 Gai

C/2019 L3 18/09/2020 23:27:20 15.56 15.13 14.98 14.96 15.04 27.5 18.1 B96

C/2019 L3 18/09/2020 23:27:20* 0.02 0.01 0.02 0.02 0.01 2 3.8 Gai

C/2019 L3 20/09/2020 22:54:06 15.51 14.92 14.75 14.71 14.72 14.78 23.4 18.2 B96

C/2019 L3 20/09/2020 22:54:06* 0.01 0.02 0.00 0.01 0.02 0.04 2 3.6 Gai

C/2019 L3 04/11/2020 22:42:26 15.16 14.61 14.42 14.36 14.39 22.7 17.8 B96

C/2019 L3 04/11/2020 22:42:26* 0.00 0.01 0.02 0.04 0.03 3 3.8 Gai

C/2019 L3 19/11/2020 19:21:41 15.02 14.45 14.28 14.20 14.18 14.19 34.4 18.2 B96

C/2019 L3 19/11/2020 19:21:41* 0.00 0.01 0.02 0.02 0.01 0.02 2 3.8 Gai

C/2019 L3 04/12/2020 22:41:36 14.87 14.25 13.97 13.76 13.47 13.29 34.9 17.9 B96

C/2019 L3 04/12/2020 22:41:36* 0.02 0.02 0.02 0.07 0.18 0.18 3 3.6 Gai

C/2019 L3 28/02/2021 19:45:42 14.41 13.78 13.54 13.40 13.32 13.27 47.3 17.6 B96

C/2019 L3 28/02/2021 19:45:42* 0.03 0.04 0.03 0.02 0.02 0.02 3 3.4 Gai

C/2019 L3 05/03/2021 21:23:05 14.38 13.73 13.49 13.36 13.28 13.21 38.0 17.7 B96

C/2019 L3 05/03/2021 21:23:05* 0.00 0.01 0.01 0.01 0.02 0.04 2 4.0 Gai

C/2019 L3 25/03/2021 20:32:26 14.25 13.61 13.37 13.24 13.19 13.16 33.0 17.0 B96

C/2019 L3 25/03/2021 20:32:26* 0.00 0.00 0.02 0.02 0.01 0.02 2 3.8 Gai

C/2019 L3 24/01/2022 20:33:12 11.90 11.06 10.63 10.34 10.13 9.97 46.1 17.8 B96

C/2019 L3 24/01/2022 20:33:12* 0.00 0.01 0.01 0.01 0.01 0.01 3 4.0 Gai

C/2019 L3 11/02/2022 20:55:07 12.10 11.28 10.85 10.57 10.36 10.20 47.1 16.9 B96

C/2019 L3 11/02/2022 20:55:07* 0.01 0.01 0.01 0.01 0.01 0.01 3 4.1 Gai

C/2019 L3 04/03/2022 21:56:54 12.32 11.49 11.06 10.78 10.58 10.43 48.5 18.0 B96

C/2019 L3 04/03/2022 21:56:54* 0.00 0.00 0.00 0.00 0.00 0.00 2 3.7 Gai

C/2019 L3 05/03/2022 21:35:18 12.36 11.53 11.10 10.81 10.62 10.46 54.9 17.5 B96

C/2019 L3 05/03/2022 21:35:18* 0.00 0.01 0.01 0.02 0.01 0.02 2 3.1 Gai

C/2019 L3 07/03/2022 21:49:58 12.33 11.49 11.05 10.77 10.57 10.42 42.5 18.1 B96

C/2019 L3 07/03/2022 21:49:58* 0.01 0.02 0.03 0.03 0.03 0.02 2 3.8 Gai

C/2019 L3 08/03/2022 21:42:38 12.34 11.50 11.07 10.80 10.60 10.45 43.8 17.9 B96

C/2019 L3 08/03/2022 21:42:38* 0.00 0.01 0.01 0.01 0.02 0.02 3 3.9 Gai

C/2019 L3 09/03/2022 22:03:12 12.36 11.52 11.09 10.81 10.61 10.46 48.3 17.5 B96

C/2019 L3 09/03/2022 22:03:12* 0.00 0.00 0.00 0.01 0.00 0.01 2 3.5 Gai

C/2019 L3 10/03/2022 22:40:41 12.36 11.52 11.09 10.81 10.61 10.45 48.5 17.3 B96

C/2019 L3 10/03/2022 22:40:41* 0.00 0.01 0.01 0.01 0.01 0.02 2 3.9 Gai

C/2019 L3 24/03/2022 19:25:07 12.53 11.71 11.28 11.00 10.80 10.64 53.6 17.4 B96

C/2019 L3 24/03/2022 19:25:07* 0.00 0.00 0.00 0.00 0.00 0.00 2 3.0 Gai

C/2019 L3 27/03/2022 20:18:58 12.51 11.67 11.25 10.97 10.77 10.62 54.1 18.0 B96

C/2019 L3 27/03/2022 20:18:58* 0.01 0.02 0.01 0.01 0.01 0.01 2 3.8 Gai

AFRHO LOG

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

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

C/2019 L3 Orbital elements not found

C/2019 L3 30/07/2019 00:24:16 7.75 8.14 3.56 18.00 5 2404 511 3.381 B96

C/2019 L3 07/08/2019 23:08:17 7.62 8.08 3.62 18.41 7 1573 228 3.197 B96

C/2019 L3 23/06/2020 00:38:21 6.36 6.03 4.34 16.70 14 2954 205 3.470 B96

C/2019 L3 25/06/2020 00:40:01 6.33 6.01 4.36 16.42 11 3769 337 3.576 B96

C/2019 L3 19/08/2020 00:15:46 5.46 5.67 5.05 16.17 22 3140 141 3.497 B96

C/2019 L3 05/09/2020 21:40:31 5.19 5.55 5.31 15.85 18 3644 204 3.562 B96

C/2019 L3 16/09/2020 22:29:15 5.04 5.49 5.47 15.80 20 3521 173 3.547 B96

C/2019 L3 18/09/2020 23:27:20 5.01 5.47 5.50 15.68 28 3878 141 3.589 B96

C/2019 L3 20/09/2020 22:54:06 4.99 5.46 5.53 15.60 23 4116 176 3.615 B96

C/2019 L3 04/11/2020 22:42:26 4.57 5.19 6.04 15.32 23 4034 178 3.606 B96

C/2019 L3 19/11/2020 19:21:41 4.50 5.10 6.13 15.12 34 4528 132 3.656 B96

C/2019 L3 04/12/2020 22:41:36 4.47 5.01 6.16 15.30 35 3680 105 3.566 B96

C/2019 L3 28/02/2021 19:45:42 4.79 4.53 5.76 14.67 47 6158 130 3.789 B96

C/2019 L3 05/03/2021 21:23:05 4.82 4.50 5.73 14.64 38 6298 166 3.799 B96

C/2019 L3 25/03/2021 20:32:26 4.90 4.40 5.62 14.49 33 7161 217 3.855 B96

C/2019 L3 24/01/2022 20:33:12 2.64 3.56 10.46 11.80 46 16038 348 4.205 B96

C/2019 L3 11/02/2022 20:55:07 2.79 3.57 9.88 12.07 47 14178 301 4.152 B96

C/2019 L3 04/03/2022 21:56:54 3.07 3.59 8.99 12.38 49 12998 268 4.114 B96

C/2019 L3 05/03/2022 21:35:18 3.08 3.59 8.94 12.43 55 12574 229 4.099 B96

C/2019 L3 07/03/2022 21:49:58 3.11 3.59 8.86 12.41 43 13109 308 4.118 B96

C/2019 L3 08/03/2022 21:42:38 3.13 3.59 8.81 12.42 44 13123 300 4.118 B96

C/2019 L3 09/03/2022 22:03:12 3.14 3.60 8.77 12.45 48 12919 267 4.111 B96

C/2019 L3 10/03/2022 22:40:41 3.16 3.60 8.72 12.45 49 12969 267 4.113 B96

C/2019 L3 23/03/2022 20:18:34 3.37 3.62 8.19 12.63 37 12707 343 4.104 B96

C/2019 L3 24/03/2022 19:25:07 3.38 3.62 8.15 12.70 54 11988 224 4.079 B96

C/2019 L3 27/03/2022 20:18:58 3.43 3.62 8.03 12.69 54 12529 232 4.098 B96

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

http://cara.uai.it

M.P.E.C. 2019-N11 Issued 2019 July 1, 20:01 UT

The Minor Planet Electronic Circulars contain information on unusual

minor planets and routine data on comets. They are published

on behalf of Division F of the International Astronomical Union by the

Minor Planet Center, Smithsonian Astrophysical Observatory,

Cambridge, MA 02138, U.S.A.

Prepared using the Tamkin Foundation Computer Network

MPC@CFA.HARVARD.EDU

URL https://www.minorplanetcenter.net/ ISSN 1523-6714

COMET C/2019 L3 (ATLAS)

This object was reported as asteroidal by the ATLAS team.

Subsequent reports by other observers have shown this to be a comet as shown below:

OC Date Reporter Coma Tail

H06 June 12 H. Sato 8" (10 x 60s)

K38 June 14 G. Baj 13"

G40 June 16 A. J. Evans 17"

204 June 16 L. Buzzi 9"

B96 June 22 E. Bryssinck 13" (11 x 120s)

N55 June 26 D. W. E. Green 6" (28 x 40s)

B96 June 26 E. Bryssinck 15"

850 June 29 D. T. Durig 12"

K88 June 30 K. Sarneczky 6" 25" in P.A. 240

Discovery:

in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program a comet was discovered as apparently an asteroidal object with a 0.5-m reflector at Haleakala, Hawaii and be found cometary by other CCD-astrometrists. So could H. Sato, Tokyo, Japan, found a strongly condensed coma 8" in diameter on his ten stacked 60-s exposures taken on 2019 June 12.4 UT . L. Buzzi, Varese, Italy, could found a diffuse, round 9" coma with no tail seen in stacked images obtained in bright moonlight on June 17.0 with a 0.84-m f/3.5 reflector. E. Bryssinck, Kruibeke, Belgium, on June 22.95 with a 0.4-m f/3.8 reflector found a diffuse 13" coma and no tail; fifteen stacked additional images obtained on June 26.98 show a diffuse, faint, and coma of size 23"x15", elongated east/west, with no specific tail; the magnitude was 18.7 in a circular aperture of radius 4".9. Also T. Chen found cometary appearance of this object (measured by D.W.E. Green), 24 images of 40 sec each reveals a coma of size around 6" (there appears to be a short extension toward the northwest).Twenty-six additional exposures taken by Chen on June 30.9 show an apparent coma of size about 4" (in seeing about 2".5), with a possible short extension toward p.a. about 110 degrees. This object was assigned as comet C/2019 L3 (ATLAS) via CBET 4644 issued on 2019 July 1 .