45 Eugenia
Eugenia (minor planet designation: 45 Eugenia) is a large asteroid of the asteroid belt. It is famed as one of the first asteroids to be found to have a moon orbiting it. It was also the second triple asteroid to be discovered, after 87 Sylvia.
| Discovery | |
|---|---|
| Discovered by | H. Goldschmidt |
| Discovery date | 27 June 1857 |
| Designations | |
MPC designation | (45) Eugenia |
| Pronunciation | /juːˈdʒiːniə/ |
Named after | Empress Eugénie |
Alternative designations | 1941 BN |
Minor planet category | Main belt |
| Adjectives | Eugenian |
| Orbital characteristics | |
| Epoch 26 November 2005 (JD 2453701.5) | |
| Aphelion | 440.305 Gm (2.943 AU) |
| Perihelion | 373.488 Gm (2.497 AU) |
Semi-major axis | 406.897 Gm (2.720 AU) |
| Eccentricity | 0.082 |
Orbital period (sidereal) | 1638.462 d (4.49 a) |
Mean anomaly | 45.254° |
| Inclination | 6.610° |
Longitude of ascending node | 147.939° |
| 85.137° | |
| Known satellites | Petit-Prince S/2004 (45) 1 |
| Physical characteristics | |
| Dimensions | 232 × 193 × 161 km 305 × 220 × 145 km |
Mean radius | 94±1 km 107.3±2.1 km |
| Mass | (5.8±0.1)×1018 kg (5.69±0.1)×1018 kg (5.8±0.2)×1018 kg |
Mean density | 1.66±0.07 g/cm3 1.1±0.1 g/cm3 1.1±0.3 g/cm3 |
Equatorial surface gravity | 0.017 m/s² |
Equatorial escape velocity | 0.071 km/s |
Sidereal rotation period | 0.2375 d (5.699 h) |
| 117±10° | |
Pole ecliptic latitude | −30±10° |
Pole ecliptic longitude | 124±10° |
| 0.065 (calculated) 0.040±0.002 | |
| F | |
| 7.46 | |
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