239 Adrastea
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For the moon of Jupiter, see Adrastea (moon).
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | August 18, 1884 |
| Designations | |
| Named after | Adrasteia |
| Alternative names |
A915 TD, 1955 MK1, 1956 UJ |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 547.578 Gm (3.66 AU) |
| Perihelion | 343.97 Gm (2.299 AU) |
| Semi-major axis | 445.774 Gm (2.98 AU) |
| Eccentricity | 0.228 |
| Orbital period | 1878.771 d (5.14 a) |
| Average orbital speed | 17.25 km/s |
| Mean anomaly | 146.519° |
| Inclination | 6.169° |
| Longitude of ascending node | 180.904° |
| Argument of perihelion | 209.06° |
| Physical characteristics | |
| Dimensions | 42.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Albedo | unknown |
| Temperature | unknown |
| Spectral type | unknown |
| Absolute magnitude (H) | 10.3 |
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239 Adrastea is a typical main belt asteroid.
It was discovered by Johann Palisa on August 18, 1884 in Vienna. It is named after the Greek nymph Adrasteia.
References
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