(13331) Helos Jupiter Trojan
Discovered on 30 September 1998 by Spacewatch at Kitt Peak.
Helos was a coastal town of Laconia listed in the Catalogue of Ships in Homer’s Iliad. It was in the realm of Menelaus and contributed ships and warriors to the Greek forces at Troy.Naming citation (WGSBN Bull. 6, #16, 6), IAU / Minor Planet Center, via NASA/JPL
Where Helos is today
Seen from above the solar system on 2026-10-14: Helos is 5.41 au from the Sun and 6.41 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 13331 |
| Provisional designation | 1998 SU52 |
| Orbit class | Jupiter Trojan |
| Diameter | 17.7 km (#2,550 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.171 |
| Rotation period | 375 hours |
| Absolute magnitude (H) | 11.49 |
| Orbital period | 11.5 years |
| Semi-major axis | 5.08 au |
| Perihelion – aphelion | 4.52 – 5.64 au |
| Eccentricity | 0.109 |
| Inclination | 2.30° |
| Closest distance between its orbit and Earth's (MOID) | 3.54 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.