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Comet C/2023 C2 (ATLAS) - 28 dec. 2025

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

http://cara.uai.it

Astrometric data for minor planet center (ADES format)

permID |provID     |trkSub  |mode|stn |obsTime                |ra         |dec        |rmsRA|rmsDec|astCat  |mag  |rmsMag|band|fltr|photCat |photAp|logSNR|seeing|exp |rmsFit|nStars|notes|remarks

       |C/2023 C2  |        | CCD|B96 |2025-12-28T18:47:18Z   |342.29133  |+48.65930  |2.59 |2.60  |   Gaia3|16.2 |0.13  |  Gr|   R|   Gaia3| 5.6  |1.03  |4.1   | 120|0.36  |  3364|     |

       |C/2023 C2  |        | CCD|B96 |2025-12-28T18:54:22Z   |342.29231  |+48.65928  |1.22 |1.23  |   Gaia3|15.5 |0.09  |  Gr|   R|   Gaia3| 5.6  |1.30  |3.8   | 120|0.34  |  3573|     |

       |C/2023 C2  |        | CCD|B96 |2025-12-28T19:03:47Z   |342.29406  |+48.65892  |0.77 |0.78  |   Gaia3|16.7 |0.18  |  Gr|   R|   Gaia3| 5.6  |0.80  |3.9   | 120|0.35  |  3572|     |

Photometric data obtained by use of KPR software:

ICQ Code:

   2023C2  2025 12 28.78  k 16.3 AR 40.0L 3a960   0.3               ICQ XX BRY04I     C 0.28mST0 K6F KPR 0 U8*0.01       1.2s 1.2 ;Comet Alt.:64.1

CometObs format:

C/2023 C2 (ATLAS):

2025  Dec.  28.78  UT: m1=16.3 CCD-R, Dia.=0.3', 40.0-cm Newtonian reflector .(Erik Bryssinck, BRIXIIS Observatory)

Af(rho) data according CARA approach

Af(rho) vs core distance [km] - data from Bessel-R filtered CCD-image