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Comet C/2021 A1 (LEONARD) -   13 june 2021

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

http://cara.uai.it

Astrometric data for minor planet center

COD B96

CON E. Bryssinck, BRIXIIS Observatory, 9150 Kruibeke , Belgium

OBS E. Bryssinck

MEA E. Bryssinck

TEL 0.4-m f/3.8 reflector + CCD

ACK MPCReport file updated 2021.06.15 14:01:04

NET Gaia DR2

    CK21A010  C2021 06 13.91412 10 32 11.12 +54 47 36.5          17.8 G      B96

    CK21A010  C2021 06 13.92229 10 32 10.82 +54 47 31.1          17.9 G      B96

    CK21A010  C2021 06 13.93208 10 32 10.31 +54 47 25.8          17.8 G      B96

----- end -----

COD G39

OBS ROAD Observatory

CATALOG: Gaia DR2 - BAND: G

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

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

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

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

Photometry obtained with FOCAS-II software:

Afρ data according CARA-approach

Afρ [cm] vs core distance [km] - data obtained from Bessel-R filtered CCD-image

Photometric data obtained by use of KOPR software

ICQ Code:

   2021A1  2021 06 13.92  k 16.6 AQ 40.0L 3A440   0.6               ICQ XX BRY04I     C 0.60mST0 K6F KPR 5 U9*0.01       1.2s 1.2 ;Comet Alt.:44.0 Calculated mags:16.6,16.6,16.6,16.6,16.6,16.6,16.6,16.6,16.6

CometObs format:

C/2021 A1 (Leonard):

2021  Jun.  13.92  UT: m1=16.6 CCD-R, Dia.=0.6', 40.0-cm Newtonian reflector .

[Comet Alt.:44.0 Calculated mags:16.6,16.6,16.6,16.6,16.6,16.6,16.6,16.6,16.6

] (Erik Bryssinck, BRIXIIS)

Afrho output:

C/2021 A1, 2459379.43194, 3.299, 3.631, 15.94, R, 9796, 152.9, 0.9

C/2021 A1, 2459379.43194, 3.299, 3.631, 15.94, R, 16328, 152.6, 0.9

C/2021 A1, 2459379.43194, 3.299, 3.631, 15.94, R, 22859, 135.8, 0.8

C/2021 A1, 2459379.43194, 3.299, 3.631, 15.94, R, 29390, 116.6, 0.7

C/2021 A1, 2459379.43194, 3.299, 3.631, 15.94, R, 35922, 112.8, 0.7

C/2021 A1, 2459379.43194, 3.299, 3.631, 15.94, R, 42453, 99.5, 0.6

C/2021 A1, 2459379.43194, 3.299, 3.631, 15.94, R, 48984, 85.2, 0.5