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Comet C/2025 K1 (ATLAS) - 18 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 |2025-08-18T20:56:40Z   |249.00553  | +8.18769  |0.21 |0.32  |   Gaia3|14.0 |0.08  |  Gr|   R|   Gaia3| 5.6  |1.84  |3.0   |  45|0.37  |   763|     |

       |C/2025 K1  |        | CCD|B96 |2025-08-18T21:03:18Z   |248.99484  | +8.18236  |0.22 |0.32  |   Gaia3|14.0 |0.08  |  Gr|   R|   Gaia3| 5.6  |1.78  |2.8   |  45|0.37  |   766|     |

       |C/2025 K1  |        | CCD|B96 |2025-08-18T21:11:02Z   |248.98220  | +8.17621  |0.21 |0.30  |   Gaia3|14.0 |0.08  |  Gr|   R|   Gaia3| 5.6  |1.90  |3.0   |  45|0.35  |   742|     |

       |C/2025 K1  |        | CCD|B96 |2025-08-18T21:17:40Z   |248.97121  | +8.17073  |0.21 |0.31  |   Gaia3|14.0 |0.08  |  Gr|   R|   Gaia3| 5.6  |1.80  |3.1   |  45|0.36  |   750|     |

       |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 18.87  k 12.5 AR 40.0L 3a900   1.5       4.2m100 ICQ XX BRY04I     C 1.52mST0 K6F KPR 0 U9*0.02       1.2s 1.2 ;Comet Alt.:37.6

CometObs format:

C/2025 K1 (ATLAS):

2025  Aug.  18.87  UT: m1=12.5 CCD-R, Dia.=1.5', 40.0-cm Newtonian reflector , Tail: 4.2 min. in p.a. 100 deg.(Erik Bryssinck, BRIXIIS Observatory)