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Comet C/2021 A1 (LEONARD) -   7 may 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 2021.05.08 16:44:09

NET Gaia DR2

    CK21A010 KC2021 05 07.85858 11 16 59.30 +60 46 50.3          17.9 R      B96

    CK21A010  C2021 05 07.86441 11 16 58.73 +60 46 45.4          18.2 G      B96

    CK21A010  C2021 05 07.87257 11 16 57.65 +60 46 44.1          18.0 G      B96

    CK21A010  C2021 05 07.88237 11 16 56.46 +60 46 39.9          18.2 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     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

                                                                     AFRHO         LOG

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

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

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

Photometry obtained with FOCAS-II software:

Data obtained from KOPR-photometric software

ICQ Code:

   2021A1  2021 05 07.87  k 17.5 AQ 40.0L 3B160   0.2       0.4m128 ICQ XX BRY04I     C 0.24mST0 K6F KPR 5 U9*0.03       1.2s 1.2

CometObs format:

C/2021 A1 (Leonard):

2021  May  07.87  UT: m1=17.5 CCD-R, Dia.=0.2', 40.0-cm Newtonian reflector , Tail: 0.4 min. in p.a. 128 deg.

[Comet Alt.:78.0 Calculated mags:17.5,17.4,17.4,17.4,17.5,17.5,17.5,17.5,17.4,17.4,17.4,17.4,17.5,17.4,17.4,17.4,17.4,17.5,17.5,17.5,17.4,17.5

] (Erik Bryssinck, BRIXIIS)

Afrho output:

C/2021 A1, 2459342.34722, 3.736, 3.587, 15.67, R,  9677, 151.1, 2.0

C/2021 A1, 2459342.34722, 3.736, 3.587, 15.67, R, 16128, 138.9, 1.8

C/2021 A1, 2459342.34722, 3.736, 3.587, 15.67, R, 22580, 127.0, 1.7

C/2021 A1, 2459342.34722, 3.736, 3.587, 15.67, R, 29032, 105.4, 1.4

C/2021 A1, 2459342.34722, 3.736, 3.587, 15.67, R, 35483, 90.6, 1.2

C/2021 A1, 2459342.34722, 3.736, 3.587, 15.67, R, 38709, 84.9, 1.1

Afρ data according CARA-approach

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