239 Adrastea
Adrastea (minor planet designation: 239 Adrastea) is a main belt asteroid. It was discovered by Johann Palisa on 18 August 1884 in Vienna. It is named after the Greek nymph Adrasteia. The asteroid is roughly 42 km in diameter.[1]
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 18 August 1884 |
| Designations | |
| (239) Adrastea | |
| Pronunciation | /ædrəˈstiːə/ |
Named after | Adrasteia |
| A915 TD, 1955 MK1, 1956 UJ | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 131.66 yr (48087 d) |
| Aphelion | 3.66279 AU (547.946 Gm) |
| Perihelion | 2.2695 AU (339.51 Gm) |
| 2.96616 AU (443.731 Gm) | |
| Eccentricity | 0.23486 |
| 5.11 yr (1865.9 d) | |
Average orbital speed | 17.25 km/s |
| 233.617° | |
| 0° 11m 34.584s / day | |
| Inclination | 6.1746° |
| 180.634° | |
| 210.15° | |
| Physical characteristics | |
| Dimensions | 41.52±1.4 km[1] |
| 18.4707 h (0.76961 d)[1] | |
| 0.0777±0.006[1] | |
| Temperature | unknown |
| unknown | |
| 10.4[1] | |
References
- "JPL Small-Body Database Browser: 239 Adrastea". Jet Propulsion Laboratory. Retrieved 12 May 2016.
External links
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- 239 Adrastea at AstDyS-2, Asteroids—Dynamic Site
- 239 Adrastea at the JPL Small-Body Database
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