516 Amherstia

Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
name=516 Amherstia
discoverer=Raymond Smith Dugan
discovered=September 20, 1903
alt_names=1903 MG; 1938 YO
mp_category=Main belt
epoch=October 22, 2004 (JD 2453300.5)
semimajor=401.045 Gm (2.681 AU)
perihelion=291.483 Gm (1.948 AU)
aphelion=510.608 Gm (3.413 AU)
eccentricity=0.273
period=1603.247 d (4.39 a)
inclination=12.956°
asc_node=328.912°
arg_peri=258.439°
mean_anomaly=139.799°
avg_speed=17.85 km/s
dimensions=73.1 km
mass=4.1×10¹⁷ kg
density=2.0 g/cm³
surface_grav=0.0204 m/s²
escape_velocity=0.0386 km/s
rotation=0.312 d [http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm 1]
spectral_type=M-type asteroid
abs_magnitude=8.27
albedo=0.163–0.173 [http://www.psi.edu/pds/archive/astdata/ALBEDOS/albedos.tab 2]
single_temperature=~167 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.