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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 |2026-01-18T21:11:40Z   |127.07554  |+16.73152  |0.34 |0.40  |  ATLAS2|16.0 |0.12  |  Gr|   R|  ATLAS2| 5.6  |1.03  |4.0   | 120|0.42  |   509|     |

     3I|           |        | CCD|B96 |2026-01-18T21:28:08Z   |127.06501  |+16.73359  |0.27 |0.35  |  ATLAS2|16.3 |0.11  |  Gr|   R|  ATLAS2| 5.6  |1.14  |4.0   | 120|0.41  |   514|     |

     3I|           |        | CCD|B96 |2026-01-18T21:44:37Z   |127.05461  |+16.73566  |0.33 |0.42  |  ATLAS2|15.5 |0.11  |  Gr|   R|  ATLAS2| 5.6  |1.07  |3.4   | 120|0.50  |   407|     |

Comet 3I/ATLAS - 18 jan. 2026

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       2026 01 18.89  k 12.1 AR 40.0L 3a960   2.2       4.3m100 ICQ XX BRY04I     C 2.24mST0 K6F KPR 0 U8*0.02       1.2s 1.2 ;Comet Alt.:42.1

CometObs format:

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

2026 01 18.89  UT: m1=12.1 CCD-R, Dia.=2.2', 40.0-cm Newtonian reflector , Tail: 4.3 min. in p.a. 100 deg.(Erik Bryssinck, BRIXIIS Observatory)

Afρ parameter according CARA approach

Afρ parameter according CARA approch - unfiltered ccd-images