(30698) Hippokoon Jupiter Trojan
Discovered on 16 October 1977 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Hippokoon was a friend of king Rhesos, from Thracia. Hippokoon and the other Thracians were fast asleep as Odysseus and Diomedes killed king Rhesus and his 12 companions. Only Hippokoon was awoken by the god Apollo.Naming citation (20030318/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hippokoon is today
Seen from above the solar system on 2026-10-14: Hippokoon is 5.24 au from the Sun and 4.56 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 30698 |
| Provisional designation | 2299 T-3 |
| Orbit class | Jupiter Trojan |
| Diameter | 18.3 km (#2,451 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.101 |
| Absolute magnitude (H) | 12.18 |
| Orbital period | 11.7 years |
| Semi-major axis | 5.17 au |
| Perihelion – aphelion | 4.84 – 5.50 au |
| Eccentricity | 0.0636 |
| Inclination | 7.88° |
| Closest distance between its orbit and Earth's (MOID) | 3.84 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 16 October 1977
- (3798) de Jager
- (3936) Elst
- (4044) Erikhog
- (4108) Rakos
- (4722) Agelaos
- (4753) Phidias
- (4754) Panthoos
- (5610) Balster
- (5699) Munch
- (5700) Homerus
- (5984) Lysippus
- (6055) Brunelleschi