C/2025 R1 ( ATLAS )

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Updated on December 22, 2025

Profile Discovery Date September 3, 2025 Magnitude 19.3 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 Nov. 23.33582 TT Pike q 1.9752056 (2000.0) P Q z +0.0060278 Peri. 77.55056 +0.39725660 -0.41818917 +/-0.0000289 Node 60.39644 -0.34453330 -0.89298879 e 0.9880939 Incl. 110.02729 +0.85057863 -0.16639962 From 334 observations 2025 Sept. 3-Dec. 13, mean residual 0".5.

Magnitudes Graph m1 = 13.0 + 5 log d + 10.0 log r

The orbital elements are published on M.P.E.C. 2025-Y51. The magnitudes graphs are made with Comet for Windows.