(20947) Polyneikes Jupiter Trojan
Discovered on 29 September 1973 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Polyneikes was the father of Thersander, son of Oedipus and friend of Diomedes' father Tydeus. Polyneikes is a main character in The Seven against Thebes. He fought against his own brother.Naming citation (20010309/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Polyneikes is today
Seen from above the solar system on 2026-10-14: Polyneikes is 5.09 au from the Sun and 6.08 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20947 |
| Provisional designation | 2638 T-2 |
| Orbit class | Jupiter Trojan |
| Absolute magnitude (H) | 12.02 |
| Orbital period | 11.4 years |
| Semi-major axis | 5.07 au |
| Perihelion – aphelion | 4.94 – 5.19 au |
| Eccentricity | 0.0241 |
| Inclination | 2.33° |
| Closest distance between its orbit and Earth's (MOID) | 3.96 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 29 September 1973
- (2049) Grietje
- (4357) Korinthos
- (4549) Burkhardt
- (4721) Atahualpa
- (4752) Myron
- (4876) Strabo
- (4978) Seitz
- (5151) Weerstra
- (5197) Rottmann
- (5243) Clasien
- (5244) Amphilochos
- (5266) Rauch