91 Aegina
| Discovery | |
|---|---|
| Discovered by | Édouard Stephan |
| Discovery date | November 4, 1866 |
| Designations | |
| MPC designation | (91) Aegina |
|
Named after
|
Aegina |
| Main belt | |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 428.453 Gm (2.864 AU) |
| Perihelion | 346.826 Gm (2.318 AU) |
| 387.640 Gm (2.591 AU) | |
| Eccentricity | 0.105 |
| 1523.536 d (4.17 a) | |
|
Average orbital speed
|
18.45 km/s |
| 183.458° | |
| Inclination | 2.109° |
| 10.806° | |
| 73.371° | |
| Physical characteristics | |
| Dimensions | 109.8 km |
| Mass | 1.4×1018 kg |
|
Mean density
|
? g/cm³ |
| 0.0307 m/s² | |
| 0.0580 km/s | |
| ? d | |
| Albedo | 0.043 |
| Temperature | ~173 K |
|
Spectral type
|
C |
| 8.84 | |
91 Aegina (/ᵻˈdʒaɪnə/ i-JY-nə) is a large main-belt asteroid. Its surface coloring is very dark and the asteroid has probably a primitive carbonaceous composition. It was discovered by a French astronomer Édouard Jean-Marie Stephan on November 4, 1866. It was his second and final asteroid discovery. The first was 89 Julia. The asteroid's name comes from Aegina, a Greek mythological figure associated with the island of the same name.
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