C/2025 J1 ( Borisov )

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Updated on October 5, 2025

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 11.79724 TT Pike q 3.5805217 (2000.0) P Q z +0.0008057 Peri. 166.61897 -0.08938905 +0.07602686 +/-0.0000118 Node 273.97768 +0.79738666 +0.60292480 e 0.9971151 Incl. 95.44432 +0.59681162 -0.79416723 From 227 observations 2025 Apr. 29-Sept. 21, mean residual 0".5.

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

The orbital elements are published on M.P.E.C. 2025-T80. The magnitudes graphs are made with Comet for Windows.