C/2025 J1 ( Borisov )

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Updated on September 4, 2026

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

Orbital Elements Epoch 2026 June 9.0 TT = JDT 2461200.5 T 2026 June 11.75248 TT Rudenko q 3.5803035 (2000.0) P Q z +0.0005407 Peri. 166.61776 -0.08941919 +0.07583484 +/-0.0000016 Node 273.98180 +0.79736908 +0.60294220 e 0.9980643 Incl. 95.43406 +0.59683059 -0.79417239 From 912 observations 2025 Apr. 29-2026 Aug. 14, mean residual 0".6.

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

The orbital elements are published on M.P.E.C. 2026-Q57. The magnitudes graphs are made with Comet for Windows.