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Comet C/2025 K1 (ATLAS) - 25 aug. 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|photCat |photAp|logSNR|seeing|exp |rmsFit|nStars|notes|remarks

       |C/2025 K1  |        | CCD|B96 |2025-08-25T20:37:45Z   |234.86868  | +0.77169  |0.25 |0.36  |   Gaia3|14.1 |0.08  |  Gr|   R|   Gaia3| 5.6  |1.66  |3.4   |  45|0.41  |   290|     |

       |C/2025 K1  |        | CCD|B96 |2025-08-25T20:44:23Z   |234.86080  | +0.76749  |0.22 |0.35  |   Gaia3|14.0 |0.07  |  Gr|   R|   Gaia3| 5.6  |1.70  |3.4   |  45|0.39  |   295|     |

       |C/2025 K1  |        | CCD|B96 |2025-08-25T20:51:00Z   |234.85285  | +0.76312  |0.29 |0.36  |   Gaia3|14.2 |0.08  |  Gr|   R|   Gaia3| 5.6  |1.44  |3.6   |  45|0.36  |   162|     |

       |C/2025 K1  |        | CCD|B96 |2025-08-25T20:58:44Z   |234.84374  | +0.75816  |0.32 |0.40  |   Gaia3|14.0 |0.08  |  Gr|   R|   Gaia3| 5.6  |1.54  |3.6   |  45|0.38  |   193|     |

       |C/2025 K1  |        | CCD|B96 |2025-08-10T22:26:37Z   |269.92281  |+17.09808  |0.23 |0.33  |   Gaia3|13.9 |0.08  |  Gr|   R|   Gaia3| 5.6  |1.77  |3.2   |  30|0.38  |  1458|     |

Af(rho) parameter according CARA-approach

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

ICQ-format - photometry:

ICQ Code:

   2025K1  2025 08 25.86  k 11.8 AR 40.0L 3a900   2.4       3.6m 98 ICQ XX BRY04I     C 2.44mST0 K6F KPR 0 U9*0.03       1.2s 1.2 ;B96 Observatory, Kruibeke, Belgium, Comet Alt.:17.4

CometObs format:

C/2025 K1 (ATLAS):

2025  Aug.  25.86  UT: m1=11.8 CCD-R, Dia.=2.4', 40.0-cm Newtonian reflector , Tail: 3.6 min. in p.a. 98 deg.(Erik Bryssinck, BRIXIIS Observatory)