
Discovery
Discovered byW. Lorenz
Discovery date12 August 1909
Designations
MPC designation(685) Hermia
Alternative designations1909 HE
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc89.52 yr (32696 d)
Aphelion2.6752 AU (400.20 Gm) Perihelion1.7969 AU (268.81 Gm)
Semi-major axis2.2360 AU (334.50 Gm)
Eccentricity0.19640
Orbital period (sidereal)3.34 yr (1221.3 d) Mean motion0° 17m 41.208s / day
Inclination3.6466°
Longitude of ascending node235.210°
Argument of perihelion80.876°
Physical characteristics
Synodic rotation period50.40 ± 0.05 h (2.1000 ± 0.0021 d) Geometric albedo0.2807±0.050
Absolute magnitude (H)12.0