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Comet C/2020 R4  (ATLAS)

Photometric data obtained from FOCAS-II software

COD B96

OBS BRIXIIS Observatory

CATALOG: Gaia DR2 - BAND: G

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

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

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

C/2020 R4     22/04/2021 22:03:10  13.68  12.96  12.58  12.28  12.05  11.86  26.1  17.3  B96

C/2020 R4     22/04/2021 22:03:10*  0.02   0.03   0.03   0.03   0.03   0.03    52   3.2  Gai

C/2020 R4     23/04/2021 20:59:21  12.91  12.39  12.09  11.85  11.65  11.49  43.5  16.6  B96

C/2020 R4     23/04/2021 20:59:21*  0.02   0.03   0.03   0.03   0.03   0.03    38   3.5  Gai

C/2020 R4     29/04/2021 21:27:14  13.27  12.31  11.82  11.51  11.28  11.10  15.7  18.3  B96

C/2020 R4     29/04/2021 21:27:14*  0.02   0.02   0.02   0.01   0.01   0.01     4   4.1  Gai

C/2020 R4     30/04/2021 21:40:02  13.58  12.58  12.07  11.74  11.50  11.31  15.5  18.1  B96

C/2020 R4     30/04/2021 21:40:02*  0.01   0.02   0.02   0.02   0.02   0.02     5   3.2  Gai

C/2020 R4     01/05/2021 22:07:35  13.78  12.74  12.26  11.94  11.69  11.49  10.9  18.0  B96

C/2020 R4     01/05/2021 22:07:35*  0.02   0.02   0.03   0.03   0.03   0.02     4   3.8  Gai

C/2020 R4     02/05/2021 20:51:26  14.00  13.06  12.57  12.24  11.98  11.78  17.3  18.3  B96

C/2020 R4     02/05/2021 20:51:26*  0.02   0.03   0.04   0.04   0.03   0.03    14   3.3  Gai

C/2020 R4     07/05/2021 21:23:57  14.38  13.52  13.07  12.75  12.50  12.29  11.5  18.2  B96

C/2020 R4     07/05/2021 21:23:57*  0.02   0.03   0.04   0.02   0.01   0.01     2   3.3  Gai

                                                                     AFRHO         LOG

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

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

C/2020 R4     22/04/2021 22:03:10    0.46   1.34  59.45  11.88   26     66     3  1.818  B96

C/2020 R4     23/04/2021 20:59:21    0.46   1.35  59.47  11.52   44     92     2  1.965  B96

C/2020 R4     29/04/2021 21:27:14    0.52   1.41  52.98  11.19   16    173    11  2.237  B96

C/2020 R4     30/04/2021 21:40:02    0.54   1.42  51.21  11.45   16    148    10  2.169  B96

C/2020 R4     01/05/2021 22:07:35    0.56   1.43  49.37  11.68   11    130    12  2.115  B96

C/2020 R4     02/05/2021 20:51:26    0.58   1.44  47.64  12.03   17    103     6  2.013  B96

C/2020 R4     07/05/2021 21:23:57    0.71   1.50  39.06  12.78   12     83     7  1.920  B96

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

http://cara.uai.it

COMET C/2020 R4 (ATLAS)                             

     J. Robinson reports the discovery of a comet on CCD images taken with a 0.5-m f/2 Schmidt reflector at Mauna Loa, Hawaii, in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program .  Four co-added 30-s images show a diffuse coma 10".3 in diameter in seeing 1".5-1".8.

Extract from CBET: ..... Forty stacked, unfiltered 30-s exposures obtained remotely on Sept. 16.2 by E. Bryssinck, M. Rocchetto, E. Guido, M. Fulle, G. Milani, C. Nassef, G. Savini, and A. Valvasori using a "Telescope Live" 0.7-m f/8 Ritchey-Chretien telescope located near Oria, Spain, show a diffuse coma about 6" in diameter. ....