(20947) Polynices
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Asteroid (20947) Polynices |
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| Properties of the orbit ( animation ) | |
| Orbit type | Jupiter Trojan (L 4 ) |
| Major semi-axis | 5.0803 AU |
| eccentricity | 0.0231 |
| Perihelion - aphelion | 4.9627 AU - 5.1978 AU |
| Inclination of the orbit plane | 2.3290 ° |
| Length of the ascending node | 52.2913 ° |
| Argument of the periapsis | 39.7501 ° |
| Sidereal period | 11.45 a |
| Mean orbital velocity | 13.15 km / s |
| Physical Properties | |
| Absolute brightness | 12.0 mag |
| history | |
| Explorer |
Cornelis van Houten Ingrid van Houten-Groeneveld |
| Date of discovery | 29th September 1973 |
| Another name | 2638 T-2 , 1998 SP 145 |
| 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. | |
(20947) Polyneikes is an asteroid belonging to the group of Jupiter Trojans . This describes asteroids that move around the sun on the Lagrange points on Jupiter's orbit .
(20947) Polyneikes was discovered on September 29, 1973 by the Dutch astronomers Cornelis Johannes van Houten , Ingrid van Houten-Groeneveld and Tom Gehrels at the Palomar Observatory ( IAU code 675). It is assigned to the Lagrangian point L 4 .
The asteroid is named after the mythological Greek hero Polynices , the son of Oedipus and friend of Tydeus . He took part in the campaign of the Seven against Thebes and fought there against his brother Eteocles , where the two killed each other.
See also
Web links
- Asteroid Polyneikes: Discovery Circumstances according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
- (20947) Polyneikes in the Small-Body Database of the Jet Propulsion Laboratory .
- (20947) Polyneikes in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).