(22203) Prothoenor Jupiter Trojan
Discovered on 24 September 1960 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Prothoenor was also a hero from Boeotia in the fight against Troy, as were Klonios and Arkesilaos.Naming citation (20010705/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Prothoenor is today
Seen from above the solar system on 2026-10-14: Prothoenor is 5.37 au from the Sun and 6.26 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 22203 |
| Provisional designation | 6020 P-L |
| Orbit class | Jupiter Trojan |
| Diameter | 24.6 km (#1,722 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0730 |
| Absolute magnitude (H) | 11.76 |
| Orbital period | 11.8 years |
| Semi-major axis | 5.20 au |
| Perihelion – aphelion | 4.67 – 5.72 au |
| Eccentricity | 0.101 |
| Inclination | 1.38° |
| Closest distance between its orbit and Earth's (MOID) | 3.65 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 24 September 1960
- (1743) Schmidt
- (1744) Harriet
- (1776) Kuiper
- (1777) Gehrels
- (1795) Woltjer
- (1808) Bellerophon
- (1809) Prometheus
- (1810) Epimetheus
- (1811) Bruwer
- (1812) Gilgamesh
- (1846) Bengt
- (1868) Thersites