(239) Adrastea
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Asteroid (239) Adrastea |
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| Properties of the orbit ( animation ) | |
| Orbit type | Outer main belt |
| Major semi-axis | 2.971 AU |
| eccentricity | 0.232 |
| Perihelion - aphelion | 2.281 AU - 3.661 AU |
| Inclination of the orbit plane | 6.2 ° |
| Length of the ascending node | 180.8 ° |
| Argument of the periapsis | 210.3 ° |
| Time of passage of the perihelion | April 7, 2013 |
| Sidereal period | 5 a 44 d |
| Mean orbital velocity | 17.0 km / s |
| Physical Properties | |
| Medium diameter | 42 km |
| Albedo | 0.0777 |
| Rotation period | 18 h 29 min |
| Absolute brightness | 10.3 mag |
| history | |
| Explorer | Johann Palisa |
| Date of discovery | August 18, 1884 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(239) Adrastea is an asteroid of the main asteroid belt discovered by Johann Palisa on August 18, 1884 .
Adrastea is another name of the nymph Amalthea from Greek mythology who raised Zeus .
Adrastea moves from 2.2993 ( perihelion ) to 3.6603 ( aphelion ) astronomical units around the sun in 5.1439 years . The orbit is 6.1690 ° inclined to the ecliptic , the orbital eccentricity is 0.2284.
Adrastea has a diameter of 42 kilometers. It has a dark surface with an albedo of 0.078. It rotates around its own axis in around 18 hours and 21 minutes.
Adrastea is also the name of a Jupiter moon , see Adrastea (moon) .