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Discovery
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|---|---|
| Discovered by | James Craig Watson |
| Discovery date | September 6, 1867 |
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Designations
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| Named after | Aurora |
| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 513.851 Gm (3.435 AU) |
| Perihelion | 431.319 Gm (2.883 AU) |
| Semi-major axis | 472.585 Gm (3.159 AU) |
| Eccentricity | 0.087 |
| Orbital period | 2050.831 d (5.61 a) |
| Average orbital speed | 16.73 km/s |
| Mean anomaly | 239.694° |
| Inclination | 7.966° |
| Longitude of ascending node | 2.709° |
| Argument of perihelion | 59.814° |
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Physical characteristics
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| Dimensions | 225×173km[2] 204.9 km (IRAS)[1] |
| Mass | 9.0×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0573 m/s² |
| Escape velocity | 0.1083 km/s |
| Rotation period | 7.22 h[1] |
| Albedo | 0.0395[1][3] |
| Temperature | ~157 K |
| Spectral type | C[1] |
| Absolute magnitude (H) | 7.57[1] |
94 Aurora ( /ɒˈrɔrə/ o-ror-ə) is one of the largest main-belt asteroids. With an albedo of only 0.04, it is darker than soot, and has a primitive compositions consisting of carbonaecous material. It was discovered by J. C. Watson on September 6, 1867, in Ann Arbor, and named after Aurora, the Roman goddess of the dawn.
Observations of an occultation using nine chords indicate an oval outline of 225×173 km.[2]
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