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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


                                                                     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


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 .