(239) Adrastea Main-belt Asteroid
Discovered on 18 August 1884 by J. Palisa at Vienna.
Where Adrastea is today
Seen from above the solar system on 2026-10-14: Adrastea is 3.47 au from the Sun and 4.23 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 239 |
| Provisional designation | A884 QA |
| Orbit class | Main-belt Asteroid |
| Diameter | 37.6 km (#1,049 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0950 |
| Rotation period | 18.5 hours |
| Absolute magnitude (H) | 10.5 |
| Orbital period | 5.11 years |
| Semi-major axis | 2.97 au |
| Perihelion – aphelion | 2.27 – 3.66 au |
| Eccentricity | 0.235 |
| Inclination | 6.17° |
| Closest distance between its orbit and Earth's (MOID) | 1.27 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by J. Palisa
- (136) Austria
- (137) Meliboea
- (140) Siwa
- (142) Polana
- (143) Adria
- (151) Abundantia
- (153) Hilda
- (155) Scylla
- (156) Xanthippe
- (178) Belisana
- (182) Elsa
- (183) Istria
← (238) Hypatia · (240) Vanadis →