(30705) Idaios Jupiter Trojan
Discovered on 16 October 1977 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Idaios was a herald of king Priam who tells Priam that Paris and Menelaos want to start a duel. Idaios is the younger son of the Hephaistos priest Dares. Idaios escaped Diomedes with the help of the god Hephaistos, because the god did not want his priest to lose both his sons.Naming citation (20030318/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Idaios is today
Seen from above the solar system on 2026-10-14: Idaios is 4.96 au from the Sun and 4.18 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 30705 |
| Provisional designation | 3365 T-3 |
| Orbit class | Jupiter Trojan |
| Diameter | 44.5 km (#870 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0740 |
| Rotation period | 15.7 hours |
| Absolute magnitude (H) | 10.47 |
| Orbital period | 11.8 years |
| Semi-major axis | 5.18 au |
| Perihelion – aphelion | 4.87 – 5.49 au |
| Eccentricity | 0.0596 |
| Inclination | 19.8° |
| Closest distance between its orbit and Earth's (MOID) | 3.88 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