90 Antiope
| Discovery [1] | |
|---|---|
| Discovered by | Robert Luther |
| Discovery date | 1 October 1866 |
| Designations | |
| (90) Antiope | |
| Pronunciation | /ænˈtaɪəpiː/ |
| 1952 BK2 | |
| Main belt (Themis family) | |
| Adjectives | Antiopean |
| Orbital characteristics | |
| Epoch 23 July 2010 (JD 2455400.5) | |
| Aphelion | 3.6494 AU |
| Perihelion | 2.6606 AU |
| 3.1550 AU | |
| Eccentricity | 0.15670 |
| 2046.9 d (5.60 yr) | |
Average orbital speed | 16.66 km/s |
| 304.12° | |
| Inclination | 2.2195° |
| 70.21° | |
| 242.96° | |
| Physical characteristics | |
| Dimensions | 93.0×87.0×83.6 km 87.8 ± 1.0 km |
| Mass | 8.3×1017 kg (whole system) ~ 4.1−4.2 ×1017 kg (components) |
Mean density | 1.25 ± 0.05 g/cm3 (each) |
| 0.687 d (16.50 h) (synchronous) | |
| 0.060 | |
| C | |
| 8.27 (together) 9.02 (each component) | |
| Discovery | |
|---|---|
| Discovered by | W. J. Merline, L. M. Close, J. C. Shelton, C. Dumas, F. Menard, C. R. Chapman, and D. C. Slater |
| Discovery date | 10 August 2000 |
| Designations | |
| Main belt (Themis family) | |
| Orbital characteristics | |
| 171 ± 1 km | |
| Eccentricity | <0.006 |
| 0.687713 ± 0.00004 d (16.5051 ± 0.0001 h) | |
Average orbital speed | 18.0 m/s |
| Satellite of | Binary with 90 Antiope |
| Physical characteristics | |
| Dimensions | 89.4×82.8×79.6 km |
| 83.8 ± 1.0 km | |
| Mass | ~ 8.1−8.5 ×1017 kg |
Equatorial escape velocity | variable; ~ 35−40 m/s |
| 0.687 d (16.50 h) (synchronous) | |
| 9.02 | |
90 Antiope is a double asteroid in the outer asteroid belt. It was discovered on 1 October 1866, by Robert Luther. In 2000, it was found to consist of two almost-equally-sized bodies orbiting each other. At average diameters of about 88 km and 84 km, both components are among the 500 largest asteroids. Antiope is a member of the Themis family of asteroids that share similar orbital elements.