239 Adrastea
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 18 August 1884 |
| Designations | |
| MPC designation | (239) Adrastea |
|
Named after
|
Adrasteia |
| A915 TD, 1955 MK1, 1956 UJ |
|
| Main belt | |
| Orbital characteristics | |
| 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° | |
| Earth MOID | 1.27588 AU (190.869 Gm) |
| Jupiter MOID | 1.78806 AU (267.490 Gm) |
| Jupiter Tisserand parameter | 3.214 |
| Physical characteristics | |
| Dimensions | 41.52±1.4 km |
| Mass | unknown |
|
Mean density
|
unknown |
|
Equatorial surface gravity
|
unknown |
|
Equatorial escape velocity
|
unknown |
| 18.4707 h (0.76961 d) | |
| 0.0777±0.006 | |
| Temperature | unknown |
| unknown | |
| 10.4 | |
239 Adrastea is a main belt asteroid. It was discovered by Johann Palisa on August 18, 1884 in Vienna. It is named after the Greek nymph Adrasteia. The asteroid is roughly 42 km in diameter.
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