258 Tyche is a relatively large main belt asteroid discovered by Robert Luther at Düsseldorf-Bilk Observatory on 4 May 1886.

[1] The stony S-type asteroid measures about 65 kilometers in diameter and has a perihelion of 2.1 AU.

[1] Tyche orbits very close to the Eunomia family of asteroids, and could be a member based on composition.

There is some uncertainty regarding Tyche's rotation period.

Various authors give values from 9.983 to 10.041 hours.