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COMET C/2021 E3 (ZTF)

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/2021 E3     20/07/2021 23:58:53  16.88  16.74                              10.6  17.8  B96

C/2021 E3     20/07/2021 23:58:53*  0.07   0.00                                 2   3.4  Gai

C/2021 E3     13/08/2021 21:17:04  16.81  16.54  16.62                       11.0  18.4  B96

C/2021 E3     13/08/2021 21:17:04*  0.02   0.08   0.10                          3   4.0  Gai

C/2021 E3     05/09/2021 20:40:19  16.55  16.37  16.46                       13.6  18.1  B96

C/2021 E3     05/09/2021 20:40:19*  0.06   0.13   0.13                          3   3.5  Gai

C/2021 E3     24/09/2021 19:38:41  16.34  16.16  16.24                       26.3  18.2  B96

C/2021 E3     24/09/2021 19:38:41*  0.02   0.05   0.03                          2   3.4  Gai

C/2021 E3     07/10/2021 19:48:28  16.25  15.78  15.60  15.50  15.44  15.40  12.7  17.6  B96

C/2021 E3     07/10/2021 19:48:28*  0.04   0.06   0.12   0.17   0.21   0.16     3   2.9  Gai

C/2021 E3     08/10/2021 20:07:36  16.33  16.05  15.97  15.91  15.95  16.04  12.6  17.6  B96

C/2021 E3     08/10/2021 20:07:36*  0.04   0.05   0.09   0.11   0.16   0.17     3   3.4  Gai

C/2021 E3     15/10/2021 20:17:28  16.14  15.92  15.75  15.66                 4.7  16.1  B96

C/2021 E3     15/10/2021 20:17:28*  0.06   0.20   0.18   0.25                   3   3.7  Gai

C/2021 E3     24/10/2021 20:01:17  16.27  15.98  16.07                        7.6  17.3  B96

C/2021 E3     24/10/2021 20:01:17*  0.03   0.02   0.03                          2   3.6  Gai

C/2021 E3     27/10/2021 19:55:20  16.24  15.85  15.86                        6.3  17.2  B96

C/2021 E3     27/10/2021 19:55:20*  0.06   0.20   0.19                          2   3.6  Gai

                                                                     AFRHO         LOG

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

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

C/2021 E3     13/08/2021 21:17:04    3.29   3.94   8.38  16.81   11    306    28  2.485  B96

C/2021 E3     05/09/2021 20:40:19    3.23   3.73   8.55  16.54   14    338    25  2.529  B96

C/2021 E3     24/09/2021 19:38:41    3.27   3.56   8.42  16.33   26    383    15  2.583  B96

C/2021 E3     07/10/2021 19:48:28    3.34   3.44   8.25  16.27   13    394    31  2.596  B96

C/2021 E3     08/10/2021 20:07:36    3.35   3.43   8.24  16.28   13    389    31  2.590  B96

C/2021 E3     15/10/2021 20:17:28    3.39   3.37   8.14  16.22    5    407    87  2.610  B96

C/2021 E3     24/10/2021 20:01:17    3.45   3.28   8.00  16.28    8    380    50  2.580  B96

C/2021 E3     27/10/2021 19:55:20    3.47   3.26   7.96  16.29    6    374    59  2.573  B96

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

http://cara.uai.it

Comet C/2021 E3 (ZTF) (astro.vanbuitenen.nl)

Discovery:

CBET 4960:  COMET C/2021 E3 (ZTF)

MPEC J71: COMET C/2021 E3 (ZTF)

     An object detected on Mar. 9 UT by Palomar Mountain-ZTF (I41) was initially reported as a possible NEO.  E. Guido reports a condensed 7" coma in a stack of 14 120-second unfiltered exposures taken on Mar. 19 by Telescope Live, Oria (Z08).  Additional reports of cometary features are as follows:

OC   Date        Reporter           Coma    Tail    PA          Exposures

B96  2021-04-17  E. Bryssinck       8"      7"     335           30x120s

N51  2021-04-18  K. Sharma          3"      5"      97              300s

last updated: 2021-05-06