190 Ismene
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|
| Orbital characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) | |
|---|---|
| Orbit type | Main belt (Hilda) |
| Semimajor axis | 3.984 AU |
| Perihelion distance | 3.319 AU |
| Aphelion distance | 4.648 AU |
| Orbital period | 7.95 years |
| Inclination | 6.17° |
| Eccentricity | 0.167 |
| Physical characteristics | |
| Diameter 2 (http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT) | 164.4 km |
| Rotation period | 6.52 hours 3 (http://www.psi.edu/pds/archive/lc.html) |
| Spectral class 2 (http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT) | P |
| Abs. magnitude 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) | 7.59 |
| Albedo 2 (http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT) | 0.058 |
| History 4 (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html) | |
| Discoverer | C. H. F. Peters, 1878 |
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 and named after Ismene, the sister of Antigone in Greek mythology.
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| (For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.) |