C/2025 L1 ( ATLAS )

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Updated on April 29, 2026

Profile Discovery Date June 6, 2025 Magnitude 18.2 mag Discoverer A. Fitzsimmons (Asteroid Terrestrial-Impact Last Alert System (ATLAS) search program) Pictures

Orbital Elements Epoch 2025 Nov. 21.0 TT = JDT 2461000.5 T 2026 Jan. 12.73477 TT Pike q 1.6796704 (2000.0) P Q z -0.0008912 Peri. 341.25021 -0.77330864 -0.46596162 +/-0.0000025 Node 208.10971 -0.39902915 -0.16933065 e 1.0014969 Incl. 114.13662 -0.49271643 +0.86845086 From 128 observations 2024 Oct. 1-2026 Apr. 16, mean residual 0".8.

Finding Charts

Magnitudes Graph m1 = 10.5 + 5 log d + 10.0 log r [ ,-50] ( - 2025 Nov. 23) m1 = 8.0 + 5 log d + 20.0 log r(t + 100) [-50, ] (2025 Nov. 23 - ) * Gray curve is: m1 = 10.5 + 5 log d + 10.0 log r

The orbital elements are published on M.P.E.C. 2026-H88. The charts are made with StellaNavigator Ver.11 (AstroArts). The magnitudes graphs are made with Comet for Windows.