132 Aethra
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|
| Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html) | |
|---|---|
| Discoverer | James C. Watson |
| Discovery date | June 13, 1873 |
| Alternate designations | A922 XB; 1949 MD; 1953 LF B (http://cfa-www.harvard.edu/iau/MPDes.html) |
| Category | Main belt (Mars crosser) |
| Orbital elements C (http://asteroid.lowell.edu/) Epoch July 14, 2004 (JD 2453200.5) | |
| Eccentricity (e) | 0.389 |
| Semi-major axis (a) | 390.199 Gm (2.608 AU) |
| Perihelion (q) | 238.558 Gm (1.595 AU) |
| Aphelion (Q) | 541.841 Gm (3.622 AU) |
| Orbital period (P) | 1538.652 d (4.21 a) |
| Mean orbital speed | 18.44 km/s |
| Inclination (i) | 25.055° |
| Longitude of the ascending node (Ω) | 258.946° |
| Argument of perihelion (ω) | 254.330° |
| Mean anomaly (M) | 89.813° |
| Physical characteristics | |
| Dimensions | 42.7 km |
| Mass | 8.2×1016 kg |
| Density | 2 ? g/cm³ |
| Surface gravity | 0.012 m/s² |
| Escape velocity | 0.023 km/s |
| Rotation period | 0.2153 d 1 (http://www.psi.edu/pds/archive/lc.html) |
| Spectral class | M? |
| Absolute magnitude | 9.38 |
| Albedo | 0.172 2 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html) |
| Mean surface temperature | ~168 K |
Discovered by James Craig Watson in 1873, 132 Aethra is a light-coloured metallic 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.
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