3I/ATLAS

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Updated on December 5, 2025

Profile Designation 3I/2025 N1 Discovery Date July 1, 2025 Magnitude 17.7 mag Discoverer Asteroid Terrestrial-Impact Last Alert System (ATLAS) search program Pictures

Orbital Elements Epoch 2025 Nov. 21.0 TT = JDT 2461000.5 T 2025 Oct. 29.48309 TT Rudenko q 1.3564537 (2000.0) P Q z -3.7888767 Peri. 128.00768 -0.96791405 -0.24578537 +/-0.0000945 Node 322.15476 -0.24886914 +0.90890114 e 6.1394356 Incl. 175.11292 -0.03473539 +0.33688021 From 4576 observations 2025 May 15-Dec. 1, mean residual 0".3.

Finding Charts

Magnitudes Graph m1 = 5.7 + 5 log d + 15.0 log r

The orbital elements are published on M.P.E.C. 2025-X18. The charts are made with StellaNavigator Ver.11 (AstroArts). The magnitudes graphs are made with Comet for Windows.