190 Ismene

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190 Ismene
Discovery
Discovered by C. H. F. Peters, 1878
Designations
Minor planet category Main belt (Hilda)
Orbital characteristics[1]
Aphelion 4.648 AU
Perihelion 3.319 AU
Semi-major axis 3.984 AU
Eccentricity 0.167
Orbital period 7.95 years
Inclination 6.17°
Physical characteristics
Rotation period 7.59
Albedo 0.058
Spectral type P
Absolute magnitude (H) 7.77[2]

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.

References[edit]

  1. ^ Yeomans, Donald K., "190 Ismene", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25. 
  2. ^ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 34: 113–119, Bibcode:2007MPBu...34..113W.