Borisov

Orbital elements

Semi-major axis

-4,146.233 AU

Eccentricity

1.002

Inclination

91.75°

Perihelion

8.239 AU

Longitude of ascending node

84.87°

Argument of periapsis

78.86°

Epoch · J2000

JD 2461295.32787 (perihelion)

Orbit class · HYP

Hyperbolic comet

Earth MOID · 3,110.7 LD

7.9932 AU

Tisserand (Jupiter)

-0.108

Orbit quality

Observations used

594

Data arc

637 days

First observed

8 January 2025

Last observed

7 October 2026

Residual RMS

0.49 ″

Solution · Otto Matic

14 October 2026

Visual & observation

Absolute magnitude (H)

6.5

Total magnitude M₁ · K₁ 8.3

6.5

Discovery & classification

Also known as 2025 B2