685 Hermia

685 Hermia is an S-type asteroid^[3] belonging to the Flora family in the Main Belt.^[2] Its diameter is about 11 km and it has an albedo of 0.281.^[4]

685 Hermia

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[1]
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°
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)[2]
Geometric albedo	0.2807±0.050
Absolute magnitude (H)	12.0