_Adrastea.png) 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° 11 34.584 / day |
| Inclination | 6.1746° |
| Longitude of ascending node | 180.634° |
| Argument of perihelion | 210.15° |
| Physical characteristics | |
| Dimensions | 41.52±1.4 km |
| Synodic rotation period | 18.4707 h (0.76961 d) |
| Geometric albedo | 0.0777±0.006 |
| Temperature | unknown |
| Spectral type | unknown |
| Absolute magnitude (H) | 10.4 |
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.
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.
References
- ^ "JPL Small-Body Database Browser: 239 Adrastea". Jet Propulsion Laboratory. Retrieved 12 May 2016.
- Carbo, Landry; et al. (October 2009), "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2008 October thru 2009 March", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, 36 (4): 152–157, Bibcode:2009MPBu...36..152C.
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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