190 Ismene
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters, 1878 |
| Discovery date | 22 September 1878 |
| Designations | |
| Main belt (Hilda) | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 121.44 yr (44357 d) |
| Aphelion | 4.6480 AU (695.33 Gm) |
| Perihelion | 3.3248 AU (497.38 Gm) |
| 3.9864 AU (596.36 Gm) | |
| Eccentricity | 0.16597 |
| 7.96 yr (2907.2 d) | |
| 134.92° | |
| 0° 7m 25.788s / day | |
| Inclination | 6.1772° |
| 175.48° | |
| 271.47° | |
| Earth MOID | 2.34759 AU (351.194 Gm) |
| Jupiter MOID | 0.773933 AU (115.7787 Gm) |
| Jupiter Tisserand parameter | 3.022 |
| Physical characteristics | |
Mean radius |
79.5 km[1] 90 km[2] |
| 6.52 h (0.272 d)3 | |
| 0.066 | |
| P | |
|
7.77[3] 7.59[1] | |
|
| |
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. Ismene orbits near the outer edge of the asteroid belt. It is one of the largest members of the Hilda asteroid family, which are locked in 3:2 resonance with the planet Jupiter.[4]
References
- 1 2 3 Yeomans, Donald K., "190 Ismene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.
- ↑
- ↑ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", The Minor Planet Bulletin, 34, pp. 113–119, Bibcode:2007MPBu...34..113W.
- ↑ Dahlgren, M.; Lagerkvist, C.-I. (October 1995), "A study of Hilda asteroids. I. CCD spectroscopy of Hilda asteroids", Astronomy and Astrophysics, 302: 907, Bibcode:1995A&A...302..907D.
External links
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