(20961) Arkesilaos Jupiter Trojan
Discovered on 19 September 1973 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Arkesilaos, who was from Boeotia, was one of the first heroes to join the Greek army.Naming citation (20010705/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Arkesilaos is today
Seen from above the solar system on 2026-10-14: Arkesilaos is 5.19 au from the Sun and 6.18 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20961 |
| Provisional designation | 1973 SS1 |
| Orbit class | Jupiter Trojan |
| Absolute magnitude (H) | 11.92 |
| Orbital period | 11.7 years |
| Semi-major axis | 5.15 au |
| Perihelion – aphelion | 5.05 – 5.24 au |
| Eccentricity | 0.0185 |
| Inclination | 9.20° |
| Closest distance between its orbit and Earth's (MOID) | 4.07 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 19 September 1973
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- (3290) Azabu
- (3548) Eurybates
- (4007) Euryalos
- (4068) Menestheus
- (4138) Kalchas
- (4230) van den Bergh
- (4387) Tanaka
- (4757) Liselotte
- (5041) Theotes
- (5928) Pindarus
- (7152) Euneus