Tags: Planet.
190 Ismene is a very large main belt asteroid. It was discovered by German-American astronomer C. H. F. Peters on September 22 1878 in Clinton New York and named after Ismene the sister of Antigone in Greek mythology.Being a P-type asteroid it has a very dark surface and may contain water. Ismene orbits near the outer edge of the asteroid belt. It is one of the Hilda asteroids which are locked in 3:2 resonance with the planet Jupiter.