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Discovery
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| Discovered by | Édouard Stephan |
| Discovery date | November 4, 1866 |
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Designations
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| Named after | Aegina |
| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 428.453 Gm (2.864 AU) |
| Perihelion | 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) |
| Average orbital speed | 18.45 km/s |
| Mean anomaly | 183.458° |
| Inclination | 2.109° |
| Longitude of ascending node | 10.806° |
| Argument of perihelion | 73.371° |
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Physical characteristics
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| 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 | C |
| Absolute magnitude (H) | 8.84 |
91 Aegina ( /ɨˈdʒaɪnə/ 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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