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Astrometric data for minor planet center

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

     3I|           |        | CCD|B96 |2025-08-18T20:31:52Z   |240.73177  |-15.92830  |0.29 |0.35  |   Gaia3|15.7 |0.09  |  Gr|   R|   Gaia3| 5.6  |1.36  |4.0   | 120|0.36  |   546|     |

     3I|           |        | CCD|B96 |2025-08-18T20:41:18Z   |240.72728  |-15.92754  |0.36 |0.44  |   Gaia3|15.9 |0.11  |  Gr|   R|   Gaia3| 5.6  |1.11  |4.2   | 120|0.40  |   516|     |

     3I|           |        | CCD|B96 |2025-08-18T20:50:43Z   |240.72345  |-15.92680  |1.04 |1.09  |   Gaia3|15.7 |0.14  |  Gr|   R|   Gaia3| 5.6  |0.96  |3.5   | 120|0.48  |   409|     |

Comet 3I/ATLAS - 18 aug. 2025

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

http://cara.uai.it

Photometric data obtained from KOPR software

ICQ Code:

  3I       2025 08 18.85  k 15.3 AR 40.0L 3A080   0.5               ICQ XX BRY04I     C 0.52mST0 K6F KPR 0 U9*0.01       1.2s 1.2 ;Comet Alt.:16.5

CometObs format:

3I/ATLAS = C/2025 N1 (ATLAS):

2025  Aug.  18.85  UT: m1=15.3 CCD-R, Dia.=0.5', 40.0-cm Newtonian reflector .(Erik Bryssinck, BRIXIIS Observatory)

Afρ parameter according CARA approach

Afρ parameter according CARA approch - unfiltered ccd-images