516 Amherstia - Definition and Overview

**516 Amherstia**
Discovery
Discoverer	Raymond Smith Dugan
Discovery Date	September 20, 1903
Alternate Designations	1903 MG; 1938 YO
Category	Main belt
Orbital Elements Epoch October 22, 2004 (JD 2453300.5)
Eccentricity (e)	0.273
Semi-Major Axis (a)	401.045 G m (2.681 AU)
Perihelion (q)	291.483 Gm (1.948 AU)
Aphelion (Q)	510.608 Gm (3.413 AU)
Orbital Period (P)	1603.247 d (4.39 a)
Mean Orbital Speed	17.85 km/s
Inclination (i)	12.956°
Longitude of the Ascending Node (Ω)	328.912°
Argument of Perihelion (ω)	258.439°
Mean Anomaly (M)	139.799°
Physical Characteristics
Dimensions	73.1 km
Mass	4.1×10¹⁷ kg
Density	2.0 g/cm³
Surface Gravity	0.0204 m/s²
Escape Velocity	0.0386 km/s
Rotation Period	0.312 d 1 (http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm)
Spectral Class	M-type asteroid
Absolute Magnitude	8.27
Albedo	0.163–0.173 2 (http://www.psi.edu/pds/archive/astdata/ALBEDOS/albedos.tab)
Mean Surface Temperature	~230 K

516 Amherstia was the 8th asteroid discovered by Raymond Smith Dugan, and was named after Amherst College, his alma mater. Amherstia is a large M-type asteroid, with an estimated diameter of 73 km. It follows an eccentric orbit between Jupiter and Mars, with an orbital period of 4.39 years.

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