 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters, 1878 |
| Discovery date | 22 September 1878 |
| Designations | |
| (190) Ismene | |
| Pronunciation | /ɪsˈmiːniː/ [1] |
Named after | Ismene |
| A878 SA; 1947 QJ; 1951 DB | |
| Main belt (Hilda) | |
| Orbital characteristics [2] | |
| 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° | |
| Physical characteristics | |
| 79.5 km [2] 90 km [3] | |
| 6.52 h (0.272 d) 3 | |
| 0.066 | |
| P | |
| 7.77 [4] 7.59 [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. 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. [5]
