(55419) Astynoos Jupiter Trojan
Discovered on 9 October 2001 by LINEAR at Socorro.
Astynoos, the son of Portiaon was a Trojan warrior mentioned in Homer’s Iliad. He was charged by Polydamas to hold the horses from Cleitus’ driverless chariot.Naming citation (WGSBN Bull. 6, #16, 9), IAU / Minor Planet Center, via NASA/JPL
Where Astynoos is today
Seen from above the solar system on 2026-10-14: Astynoos is 5.39 au from the Sun and 4.66 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 55419 |
| Provisional designation | 2001 TF19 |
| Orbit class | Jupiter Trojan |
| Diameter | 31.4 km (#1,303 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0940 |
| Absolute magnitude (H) | 11.19 |
| Orbital period | 12.0 years |
| Semi-major axis | 5.24 au |
| Perihelion – aphelion | 5.01 – 5.48 au |
| Eccentricity | 0.0450 |
| Inclination | 28.7° |
| Closest distance between its orbit and Earth's (MOID) | 3.99 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.