C/2025 B2 ( Borisov )

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Updated on December 22, 2025

Profile Discovery Date January 20, 2025 Magnitude 20.3 mag Discoverer Gennady Borisov (Nauchnij, Crimea) Pictures

Orbital Elements Epoch 2025 Nov. 21.0 TT = JDT 2461000.5 T 2026 Sept. 11.62436 TT Pike q 8.2391470 (2000.0) P Q z -0.0001912 Peri. 78.84922 +0.04705430 -0.08192089 +/-0.0000120 Node 84.86664 -0.21581735 -0.97392552 e 1.0015756 Incl. 91.74466 +0.97529932 -0.21156099 From 203 observations 2025 Jan. 8-Dec. 14, mean residual 0".5.

Magnitudes Graph m1 = 5.5 + 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.