C/2025 B2 ( Borisov )

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Updated on October 5, 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. 11.28777 TT Pike q 8.2400203 (2000.0) P Q z -0.0001638 Peri. 78.82623 +0.04709065 -0.08189331 +/-0.0000428 Node 84.86709 -0.21542644 -0.97401272 e 1.0013500 Incl. 91.74495 +0.97538399 -0.21116984 From 162 observations 2025 Jan. 8-Aug. 18, 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-R69. The magnitudes graphs are made with Comet for Windows.