Crommelin

Orbit and dynamics

The path is an ellipse reaching 0.734 AU from the Sun at perihelion and 17.452 AU at aphelion, a radial span of 16.718 AU.

Applying Kepler's third law to a = 9.093 AU gives an orbital period of 27.4 yr, or about 10,015 days.

The high eccentricity (0.919) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 29.22° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 48.2 km/s at perihelion and falls to 2 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 = 1.48, a standard discriminator between asteroidal and cometary dynamics.

Size and surface

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

Observation record and orbit quality

The current orbit solution is based on 455 observations and has a weighted RMS residual of 0.832 arcseconds.

Condition code U = 0 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.