132 Aethra
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Discovery
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| Discovered by | James C. Watson |
| Discovery date | June 13, 1873 |
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Designations
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| Alternative names | A922 XB; 1949 MD; 1953 LF |
| Minor planet category |
Main belt (Mars crosser) |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 541.841 Gm (3.622 AU) |
| Perihelion | 238.558 Gm (1.595 AU) |
| Semi-major axis | 390.199 Gm (2.608 AU) |
| Eccentricity | 0.389 |
| Orbital period | 1538.652 d (4.21 a) |
| Average orbital speed | 17.72 km/s |
| Mean anomaly | 89.813° |
| Inclination | 25.055° |
| Longitude of ascending node | 258.945° |
| Argument of perihelion | 254.330° |
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Physical characteristics
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| Dimensions | 42.7 km |
| Mass | 8.2×1016 kg |
| Mean density | 2 ? g/cm³ |
| Equatorial surface gravity | 0.012 m/s² |
| Escape velocity | 0.023 km/s |
| Rotation period | 0.2153 d [1] |
| Albedo | 0.172 [2] |
| Temperature | ~168 K |
| Spectral type | M |
| Absolute magnitude | 9.38 |
Discovered by James Craig Watson in 1873, 132 Aethra is a M-type main belt asteroid. It has a rather eccentric orbit that sometimes brings it closer to the Sun than the planet Mars. It was the first such Mars-crosser asteroid to be identified.
The varying light curve of the asteroid implies an elongated or irregular shape for its body.
It is named after Aethra, the mother of Theseus in Greek mythology.
[edit] References
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