239 Adrastea
| | |
| Discovery A | |
|---|---|
| Discoverer | Johann Palisa |
| Discovery date | August 18, 1884 |
| Alternate designations | A915 TD, 1955 MK1, 1956 UJ B |
| Category | Main belt |
| Orbital elements C D | |
| Eccentricity (e) | 0.228 |
| Semi-major axis (a) | 445.774 Gm (2.98 AU) |
| Perihelion (q) | 343.97 Gm (2.299 AU) |
| Aphelion (Q) | 547.578 Gm (3.66 AU) |
| Orbital period (P) | 1878.771 d (5.14 a) |
| Mean orbital speed | 17.25 km/s |
| Inclination (i) | 6.169° |
| Longitude of the ascending node (Ω) | 180.904° |
| Argument of perihelion (ω) | 209.06° |
| Mean anomaly (M) | 146.519° |
| Physical characteristics | |
| Dimensions | 42.0 km |
| Mass | unknown |
| Density | unknown |
| Surface Gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Spectral class | unknown |
| Absolute magnitude | 10.3 |
| Albedo | unknown |
| Mean surface Temperature | unknown |
239 Adrastea is a typical Main belt Asteroid.
It was discovered by Johann Palisa on August 18, 1884 in Vienna.
Adrastea is also a moon of Planet Jupiter. Both were named after Greek goddess Adrasteia.