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Observation date

image

Photometry

(FOCAS)

Afρ

astrometry

Observatory

20240110

X

X


X

B96 - BRIXIIS

20240116

X

X

X

X

B96 - BRIXIIS





































COMET C/2021 S4 (TSUCHINSHAN)

Photometric data obtained from FOCAS-II software



CATALOG: Gaia DR2 - BAND: G


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

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

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

C/2021 S4     10/01/2024 20:54:22  17.69  17.36  17.44                        8.9  18.1  B96

C/2021 S4     10/01/2024 20:54:22*  0.12   0.14   0.17                          4   3.5  Gai

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     10/01/2024 20:54:22    5.91   6.69   4.66  17.84    9   1097   123  3.040  B96

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


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


http://cara.uai.it

Comet C/2021 S4 (TSUCHINSHAN) (astro.vanbuitenen.nl)


Discovery:  (CBET 5052)


    R. Haver and R. Gorelli report cometary activity of an asteroidal NEOCP  candidate in forty 90-second images taken on Oct. 2 UT by Frasso Sabino (157), noting a diffuse 8" coma. Prediscovery images were reported dating back to early September.  Additional reports of cometary features are as follows:


OC   Date        Reporter           Coma    Tail    PA          Exposures


F52  2021-09-08  R. Weryk           0".5                          4x45s

F51  2021-09-30  R. Weryk           0".4                          4x60s



Source: MPEC 2021-T167: COMET C/2021 S4 (TSUCHINSHAN)