Borisov

Orbit and dynamics

Between its closest point (0.447 AU) and its farthest (197.5 AU), the heliocentric distance changes by 197.1 AU over every revolution.

One full revolution takes 985 yr (359,676 days), computed from the semi-major axis of 98.98 AU.

The high eccentricity (0.996) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 53.07° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 62.9 km/s at perihelion and falls to 0.1 km/s at aphelion.

Because q < 1 AU and Q > 1 AU, this orbit geometrically intersects the region of Earth's orbit.

Its Tisserand parameter with respect to Jupiter is T_J = 0.55, a standard discriminator between asteroidal and cometary dynamics.

Size and surface

Neither a measured diameter nor a reliable absolute magnitude is available for Borisov, so its physical size remains unconstrained.

Observation record and orbit quality

Astrometry from 60 individual observations underpins this orbit; the fit leaves an RMS residual of 0.9987 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.