C/2025 B2 ( Borisov )

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Updated on September 4, 2026

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

Orbital Elements Epoch 2026 June 9.0 TT = JDT 2461200.5 T 2026 Sept. 11.95355 TT Pike q 8.2387627 (2000.0) P Q z -0.0002918 Peri. 78.87163 +0.04703436 -0.08186638 +/-0.0000019 Node 84.87062 -0.21619701 -0.97384661 e 1.0024040 Incl. 91.74614 +0.97521619 -0.21194499 From 473 observations 2025 Jan. 8-2026 Aug. 23, mean residual 0".5.

Magnitudes Graph m1 = -19.0 + 5 log d + 35.0 log r

The orbital elements are published on M.P.E.C. 2026-Q97. The magnitudes graphs are made with Comet for Windows.