(9857) Hecamede Jupiter Trojan
Discovered on 10 March 1991 by R. H. McNaught at Siding Spring.
Hecamede was a daughter of Arsinous, held captive as a servant of King Nestor, to whom she served a restorative potion of wine, goat cheese, and barley.Naming citation (WGSBN Bull. 1, #12, 7), IAU / Minor Planet Center, via NASA/JPL
Where Hecamede is today
Seen from above the solar system on 2026-10-14: Hecamede is 5.17 au from the Sun and 6.12 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9857 |
| Provisional designation | 1991 EN |
| Orbit class | Jupiter Trojan |
| Diameter | 49.5 km (#761 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0600 |
| Absolute magnitude (H) | 10.32 |
| Orbital period | 11.8 years |
| Semi-major axis | 5.17 au |
| Perihelion – aphelion | 5.04 – 5.30 au |
| Eccentricity | 0.0248 |
| Inclination | 19.6° |
| Closest distance between its orbit and Earth's (MOID) | 4.03 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.