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COMET C/2021 A1 (LEONARD)

Photometric data obtained from FOCAS-II software

OBS BRIXIIS Observatory

CATALOG: Gaia DR2 - BAND: G

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

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

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

C/2021 A1     18/04/2021 21:49:58  18.00  17.49  17.40                        8.5  18.0  B96

C/2021 A1     18/04/2021 21:49:58*  0.08   0.07   0.02                          2   3.9  Gai

C/2021 A1     16/04/2021 20:44:12  17.98  17.75  17.62                        6.5  18.0  B96

C/2021 A1     16/04/2021 20:44:12*  0.03   0.03   0.03                          2   3.8  Gai

C/2021 A1     20/04/2021 21:39:30  17.93  17.40  17.39  16.84  16.57  16.44   3.1  16.8  B96

C/2021 A1     20/04/2021 21:39:30*  0.04   0.23   0.12   0.23   0.24   0.38     2   3.9  Gai

C/2021 A1     23/04/2021 20:32:06  17.98  17.66  17.76                        7.4  17.5  B96

C/2021 A1     23/04/2021 20:32:06*  0.01   0.04   0.04                          2   3.8  Gai

C/2021 A1     25/04/2021 22:47:15  17.99  17.72  17.75                        7.9  17.7  B96

C/2021 A1     25/04/2021 22:47:15*  0.11   0.08   0.06                          3   3.7  Gai

C/2021 A1     29/04/2021 21:57:50  18.10  17.75  17.70                        9.5  18.5  B96

C/2021 A1     29/04/2021 21:57:50*  0.13   0.16   0.03                          3   3.7  Gai

C/2021 A1     30/04/2021 20:55:29  18.00  17.66  17.66                        8.7  18.1  B96

C/2021 A1     30/04/2021 20:55:29*  0.03   0.04   0.08                          2   3.6  Gai

C/2021 A1     01/05/2021 21:24:11  18.07  17.54  17.46                        1.3  18.1  B96

C/2021 A1     01/05/2021 21:24:11*  0.06   0.00   0.17                          2   4.8  Gai

C/2021 A1     07/05/2021 20:57:17  17.97  17.63  17.47  17.56                 4.5  18.3  B96

C/2021 A1     07/05/2021 20:57:17*  0.07   0.15   0.25   0.41                   3   3.7  Gai

C/2021 A1     29/05/2021 21:54:54  18.03  17.71  17.52  17.32  17.13  17.19   8.4  18.1  B96

C/2021 A1     29/05/2021 21:54:54*  0.09   0.02   0.14   0.16   0.17   0.14     2   3.5  Gai

C/2021 A1     06/06/2021 21:56:00  17.87  17.59  17.41                        4.6  17.9  B96

C/2021 A1     06/06/2021 21:56:00*  0.17   0.26   0.23                          4   3.4  Gai

C/2021 A1     07/06/2021 22:05:46  17.76  17.35  17.26  17.36                 6.0  17.6  B96

C/2021 A1     07/06/2021 22:05:46*  0.11   0.28   0.35   0.74                   3   3.4  Gai

C/2021 A1     12/06/2021 22:37:22  17.93  17.88  17.34  17.24  17.18          6.1  16.8  B96

C/2021 A1     12/06/2021 22:37:22*  0.52   0.55   0.30   0.53   0.98            3   4.1  Gai

C/2021 A1     13/06/2021 22:08:52  17.67  17.26  17.12                        4.8  17.8  B96

C/2021 A1     13/06/2021 22:08:52*  0.06   0.05   0.15                          3   4.0  Gai

                                                                     AFRHO         LOG

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

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

C/2021 A1     18/04/2021 21:49:58    2.17   1.37  12.69  17.83    9      6     1  0.798  B96

C/2021 A1     16/04/2021 20:44:12    2.13   1.36  12.93  17.90    7      6     1  0.750  B96

C/2021 A1     20/04/2021 21:39:30    2.21   1.38  12.48  17.83    3      7     2  0.822  B96

C/2021 A1     23/04/2021 20:32:06    2.26   1.40  12.20  17.89    7      7     1  0.828  B96

C/2021 A1     25/04/2021 22:47:15    2.30   1.41  12.01  17.92    8      7     1  0.839  B96

C/2021 A1     29/04/2021 21:57:50    2.36   1.44  11.70  18.02   10      7     1  0.838  B96

C/2021 A1     30/04/2021 20:55:29    2.37   1.45  11.64  17.92    9      8     1  0.886  B96

C/2021 A1     01/05/2021 21:24:11    2.38   1.46  11.57  17.95    1      8     6  0.883  B96

C/2021 A1     07/05/2021 20:57:17    2.46   1.50  11.21  17.88    5      9     2  0.963  B96

C/2021 A1     29/05/2021 21:54:54    2.61   1.69  10.55  18.02    8     12     1  1.065  B96

C/2021 A1     06/06/2021 21:56:00    2.62   1.76  10.51  17.85    5     15     3  1.173  B96

C/2021 A1     07/06/2021 22:05:46    2.62   1.77  10.51  17.67    6     18     3  1.250  B96

C/2021 A1     12/06/2021 22:37:22    2.62   1.82  10.54  17.99    6     14     2  1.143  B96

C/2021 A1     13/06/2021 22:08:52    2.61   1.83  10.55  17.63    5     20     4  1.293  B96

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

http://cara.uai.it

COMET C/2021 A1 (LEONARD) (astro.vanbuitenen.nl)

Discovery:  CBET 4907:  COMET C/2021 A1

G. J. Leonard report the discovery of a comet, found on on CCD images taken on 2021 jan. 3.54-3.56 UT, (a year before perihelion) taken with the with the Mount Lemmon Survey's 1.5-m reflector. Leonard noted a condensed coma about 10" across with a short tail some 5" long in p.a. 250-270 degrees in four co-added 30-s exposures.  This comet is a inbound long period comet.

On 12 December 2021 the comet will be 0.233 AU (34.9 million km) from Earth.  It will make its closest approach to the Sun on 3 January 2022. It may reach naked eye visibility in December 2021. At an apparent magnitude of 4, it should be a good binocular comet