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, and was named after the Greek nymph Adrasteia. This asteroid is orbiting the Sun at a distance of 2.97 AU with a period of 5.11 years and an eccentricity (ovalness) of 0.23. The orbital plane is tilted at an angle of 6.17° to the plane of the ecliptic.
3D model based on lightcurve data | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 18 August 1884 |
| Designations | |
MPC designation | (239) Adrastea |
| Pronunciation | /ædrəˈstiːə/ |
Named after | Adrasteia |
Alternative designations | A884 QA, 1915 TD 1955 MK1, 1956 UJ |
Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 131.66 yr (48,087 d) |
| Aphelion | 3.66279 AU (547.946 Gm) |
| Perihelion | 2.2695 AU (339.51 Gm) |
Semi-major axis | 2.96616 AU (443.731 Gm) |
| Eccentricity | 0.23486 |
Orbital period (sidereal) | 5.11 yr (1,865.9 d) |
Average orbital speed | 17.25 km/s |
Mean anomaly | 233.617° |
Mean motion | 0° 11m 34.584s / day |
| Inclination | 6.1746° |
Longitude of ascending node | 180.634° |
| 210.15° | |
| Physical characteristics | |
| Dimensions | 41.52±1.4 km |
Synodic rotation period | 18.4707 h (0.76961 d) |
| 0.0777±0.006 | |
| Temperature | unknown |
| unknown | |
| 10.4 | |
Photometric data collected during 2009 were used for light curve analysis of this asteroid, yielding a rotation period of 18.48±0.03 h with a brightness variation of 0.45±0.05 in magnitude. The result is close to the 18.347±0.003 h period from a study performed in 2003. The asteroid is roughly 42 km in diameter.
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