.png) 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° 17 41.208 / day |
| Inclination | 3.6466° |
| Longitude of ascending node | 235.210° |
| Argument of perihelion | 80.876° |
| Physical characteristics | |
| Mean radius | 5.475±0.45 km |
| Synodic rotation period | 50.40 ± 0.05 h (2.1000 ± 0.0021 d) |
| Geometric albedo | 0.2807±0.050 |
| Absolute magnitude (H) | 12.0 |
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.
References
- "685 Hermia (1909 HE)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
- ^ Kryszczynska, A.; et al. (October 2012). "Do Slivan states exist in the Flora family?. I. Photometric survey of the Flora region". Astronomy & Astrophysics. 546: 51. Bibcode:2012A&A...546A..72K. doi:10.1051/0004-6361/201219199. A72.
- "Asteroid Taxonomy". PDS Asteroid/Dust Archive. NASA. Archived from the original on 5 August 2009.
- "Supplemental IRAS Minor Planet Survey (SIMPS) and IRAS Minor Planet Survey (IMPS)". PDS Asteroid/Dust Archive. NASA. Archived from the original on 19 January 2007.
External links
- 685 Hermia at AstDyS-2, Asteroids—Dynamic Site
- 685 Hermia at the JPL Small-Body Database
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