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Comet C/2021 S4 (TSUCHINSHAN) - 16 jan. 2024

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 2024.01.17 13:52:58

NET Gaia DR2

    CK21S040  C2024 01 16.89176 04 32 42.79 +41 00 43.9          18.9 R      B96

    CK21S040  C2024 01 16.90108 04 32 42.69 +41 00 43.5          19.7 R      B96

    CK21S040  C2024 01 16.91039 04 32 42.58 +41 00 43.3          16.2 R      B96

----- end -----

COD Z08

OBS BRIXIIS Observatory

CATALOG: Gaia DR2 - BAND: G

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

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

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

C/2021 S4     16/01/2024 21:30:50  17.16  16.40  16.18  16.11                 1.6  18.1  B96

C/2021 S4     16/01/2024 21:30:50*  0.23   0.28   0.23   0.14                   2   3.4  Gai

                                                                     AFRHO         LOG

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

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

C/2021 S4     16/01/2024 21:30:50    5.97   6.69   4.62  17.68    2   1300   812  3.114  B96

Photometry obtained with FOCAS-II software:

 Image taken with my 0.4-m f/3.8 corrected newton in my backyard (B96). 9 exposures of 180sec each were taken with SLOAN r’ filter.

Af(rho) parameter according CARA-approach

Af(rho) [cm] vs. core distance [km] - data obtained from SLOAN r’ filtered image