685 Hermia

685 Hermia
Discovery
A three-dimensional model of 685 Hermia based on its light curve.
Discovered by	W. Lorenz
Discovery site	Heidelberg
Discovery date	12 August 1909
Designations
Alternative names	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	3.34 yr (1221.3 d)
Mean anomaly	4.11590°
Mean motion	0° 17^m 41.208^s / day
Inclination	3.6466°
Longitude of ascending node	235.210°
Argument of perihelion	80.876°
Earth MOID	0.787259 AU (117.7723 Gm)
Jupiter MOID	2.60969 AU (390.404 Gm)
Jupiter Tisserand parameter	3.610
Physical characteristics
Mean radius	7000547499999999999♠5.475±0.45 km
Rotation period	50.40 h (2.100 d)
Geometric albedo	6999280700000000000♠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.

External links

Discovery · Orbit diagram · Orbital elements · Physical parameters

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