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COMET C/2021 S1 (ATLAS)

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

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

                                                                     AFRHO         LOG

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

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

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

http://cara.uai.it

Comet C/2021 S1 (ATLAS) (astro.vanbuitenen.nl)

Discovery:  (CBET 5047)

     A. Fitzsimmons reports the discovery of a comet in four 30-second survey images taken on Sep. 27 UT by ATLAS-HKO (T05), noting a condensed 9" coma.  

Additional reports of cometary features are as follows:

OC   Date        Reporter           Coma    Tail    PA          Exposures

204  2021-09-28  A. Aletti          8"      30"    315

Z08  2021-09-29  E. Bryssinck       8"                           17x120s

H06  2021-09-29  N. Paul           11".5                         10x60s

L06  2021-09-30  P. Sicoli          7"      16"    345

G18  2021-09-30  A. Valvasori      10"                           38x120s

G00  2021-10-01  M. Jaeger         13"

I22  2021-10-01  F. D. Romanov      5"                           24x60s

G40  2021-10-02  B. Lutkenhoner     7"                           27x50s

Source: MPEC 2021-T21 : COMET C/2021 S1 (ATLAS)