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COMET C/2023 A3 (Tsuchinshan-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

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

C/2023 A3     01/03/2023 07:07:30  18.04  17.95  18.03  18.08  18.08          8.3  20.1  X02

C/2023 A3     01/03/2023 07:07:30*  0.02   0.00   0.01   0.08   0.19            3   1.3  Gai

C/2023 A3     17/05/2023 23:32:37  16.68  16.50  16.50  16.57                25.6  18.0  B96

C/2023 A3     17/05/2023 23:32:37*  0.04   0.05   0.08   0.01                   2   3.5  Gai

                                                                     AFRHO         LOG

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

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

C/2023 A3     01/03/2023 07:07:30    6.84   7.25   4.03  17.96    8   1545   186  3.189  X02

C/2023 A3     17/05/2023 23:32:37    5.63   6.55   4.90  16.70   26   2720   106  3.435  B96

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

http://cara.uai.it

Comet C/2023 A3 (Tsuchinshan-ATLAS) (astro.vanbuitenen.nl)

Discovery: CBET 5228:  COMET C/2023 A3

     Q.-Z. Ye reports cometary activity of an asteroidal NEOCP candidate (initially reported by ATLAS South Africa - M22 on Feb. 22 UT) in prediscovery images obtained by Palomar Mountain-ZTF (I41) on Dec 12, 2022 UT, noting a very condensed 2" coma and a straight 10" tail at position angle 230-250 deg.

The object was independently discovered on Jan. 9 UT at Purple Mountain Observatory, XuYi Station (D29).  Additional reports of cometary features are as follows:

OC   Date        Reporter           Coma    Tail    PA          Exposures

Q62  2023-02-25  R. Fidrich         9"

Q62  2023-02-23  H. Sato            6"                            6x120s

V21  2023-02-27  D. T. Durig        8"

Y00  2023-02-28  C. Jacques        11"                           100x30s

MPEC D77: COMET C/2023 A3 (Tsuchinshan-ATLAS)