(9817) Thersander Jupiter Trojan
Discovered on 24 September 1960 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Thersander, a son of the Theban Polyneices, was wounded by Telephus and later was one of the heroes in the Wooden Horse.Naming citation (19990402/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Thersander is today
Seen from above the solar system on 2026-10-14: Thersander is 5.12 au from the Sun and 6.03 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9817 |
| Provisional designation | 6540 P-L |
| Orbit class | Jupiter Trojan |
| Diameter | 22.9 km (#1,867 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.102 |
| Absolute magnitude (H) | 11.55 |
| Orbital period | 11.9 years |
| Semi-major axis | 5.22 au |
| Perihelion – aphelion | 5.02 – 5.43 au |
| Eccentricity | 0.0391 |
| Inclination | 9.18° |
| Closest distance between its orbit and Earth's (MOID) | 4.05 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