190 Ismene is a very large main belt asteroid. 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.
It was discovered by C. H. F. Peters on September 22, 1878 in Clinton, New York and named after Ismene, the sister of Antigone in Greek mythology.
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