685 Hermia
685 Hermia is an S-type asteroid belonging to the Flora family in the Main Belt. Its diameter is about 11 km and it has an albedo of 0.281.
A three-dimensional model of 685 Hermia based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | W. Lorenz |
| Discovery site | Heidelberg Obs. |
| Discovery date | 12 August 1909 |
| Designations | |
MPC designation | (685) Hermia |
Alternative designations | 1909 HE |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 89.52 yr (32696 d) |
| Aphelion | 2.6752 AU (400.20 Gm) |
| Perihelion | 1.7969 AU (268.81 Gm) |
Semi-major axis | 2.2360 AU (334.50 Gm) |
| Eccentricity | 0.19640 |
Orbital period (sidereal) | 3.34 yr (1221.3 d) |
Mean anomaly | 4.11590° |
Mean motion | 0° 17m 41.208s / day |
| Inclination | 3.6466° |
Longitude of ascending node | 235.210° |
| 80.876° | |
| Physical characteristics | |
Mean radius | 5.475±0.45 km |
Synodic rotation period | 50.40 ± 0.05 h (2.1000 ± 0.0021 d) |
| 0.2807±0.050 | |
| 12.0 | |
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