C/2025 J1 ( Borisov )

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Updated on January 24, 2026

Profile Discovery Date May 2, 2025 Magnitude 19.3 mag Discoverer Gennady Borisov (Nauchnij, Crimea) Pictures

Orbital Elements Epoch 2025 Nov. 21.0 TT = JDT 2461000.5 T 2026 June 11.80735 TT Alexandersen q 3.5803804 (2000.0) P Q z +0.0008185 Peri. 166.62207 -0.08936064 +0.07604544 +/-0.0000033 Node 273.97614 +0.79742139 +0.60288005 e 0.9970694 Incl. 95.44476 +0.59676948 -0.79419943 From 479 observations 2025 Apr. 29-2026 Jan. 10, mean residual 0".4.

Magnitudes Graph m1 = 8.0 + 5 log d + 10.0 log r

The orbital elements are published on M.P.E.C. 2026-A90. The magnitudes graphs are made with Comet for Windows.