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91 Aegina
From Wikipedia, the free encyclopedia
| Discovery | |
|---|---|
| Discovered by: | Édouard Stephan |
| Discovery date: | November 4, 1866 |
| Alternative names: | |
| Minor planet category: | Main belt |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion distance: | 428.453 Gm (2.864 AU) |
| Perihelion distance: | 346.826 Gm (2.318 AU) |
| Semi-major axis: | 387.640 Gm (2.591 AU) |
| Eccentricity: | 0.105 |
| Orbital period: | 1523.536 d (4.17 a) |
| Avg. orbital speed: | 18.45 km/s |
| Mean anomaly: | 183.458° |
| Inclination: | 2.109° |
| Longitude of ascending node: | 10.806° |
| Argument of perihelion: | 73.371° |
| Physical characteristics | |
| Dimensions: | 109.8 km |
| Mass: | 1.4×1018 kg |
| Mean density: | ? g/cm³ |
| Equatorial surface gravity: | 0.0307 m/s² |
| Escape velocity: | 0.0580 km/s |
| Rotation period: | ? d |
| Albedo: | 0.043 [1] |
| Temperature: | ~173 K |
| Spectral type: | ? |
| Absolute magnitude: | 8.84 |
91 Aegina (e-jye'-na) 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.
| Minor planets | ||
|---|---|---|
| Previous minor planet | 91 Aegina | Next minor planet |
| List of asteroids | ||
Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Comets · Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud)
For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons and the Solar System.
For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.