31 Euphrosyne
Euphrosyne (minor planet designation: 31 Euphrosyne) is a very young asteroid. It is one of the largest asteroids (approximately tied for 7th place, to within measurement uncertainties). It was discovered by James Ferguson on September 1, 1854, the first asteroid found from North America. It is named after Euphrosyne, one of the Charites in Greek mythology. In 2019 a small companion was discovered. It is the third-roundest known asteroid (after 1 Ceres and 10 Hygiea); this is thought to be due to having re-accreted after being disrupted by a collision, and it is not close to hydrostatic equilibrium.
| Discovery | |
|---|---|
| Discovered by | J. Ferguson |
| Discovery date | September 1, 1854 |
| Designations | |
MPC designation | (31) Euphrosyne |
| Pronunciation | /juːˈfrɒsɪniː/ |
Named after | Εὐφροσύνη Eyphrosynē |
Alternative designations | A907 GP; A918 GB |
Minor planet category | Main belt |
| Adjectives | Euphrosynean /juːfrɒsɪˈniːən/ |
| Orbital characteristics | |
| Epoch April 27, 2019 (JD 2458600.5) | |
| Aphelion | 3.8523 AU (576.296 Gm) |
| Perihelion | 2.4585 AU (367.786 Gm) |
Semi-major axis | 3.1554 AU (472.041 Gm) |
| Eccentricity | 0.2209 |
Orbital period (sidereal) | 5.61 yr (2041.585 d) |
Mean anomaly | 87.1671° |
| Inclination | 26.3033° |
Longitude of ascending node | 31.1186° |
| 61.4704° | |
| Known satellites | 1 |
| Physical characteristics | |
| Dimensions | c/a = 0.86±0.07 (294±6) × (280±10) × (248±6) km |
Mean diameter | 268±4 km 267.1±2.6 km (IRAS) 268±6 km |
| Mass | (16.5±2.6)×1018 kg (17±3)×1018 kg |
Mean density | 1.64±0.27 g/cm3 1.66±0.24 g/cm3 |
Synodic rotation period | 0.230400 d (5.529595 h) |
| 0.05 0.0543 | |
| C | |
| 10.16 to 13.61 | |
| 6.74 | |
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