- 13 Egeria
Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
name=13 Egeria
discoverer=Annibale de Gasparis
discovered=November 2, 1850
alt_names="none"
mp_category=Main belt
epoch=July 14, 2004 (JD 2453200.5)
semimajor=385.336 Gm (2.576 AU)
perihelion=352.719 Gm (2.358 AU)
aphelion=417.953 Gm (2.794 AU)
eccentricity=0.085
period=1509.977 d (4.13 a)
inclination=16.540°
asc_node=43.305°
arg_peri=81.401°
mean_anomaly=339.787°
avg_speed=18.56 km/s
dimensions=207.6 km (217×196 km)
mass=~9.4e|18 kg
density=2 ? g/cm³
surface_grav=~0.0580 m/s²
escape_velocity=~0.1098 km/s
rotation=0.2935 d [ [http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm] Dead link|date=March 2008]
spectral_type=G-type asteroid
abs_magnitude=6.74
albedo=0.083 [ [http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab] Dead link|date=March 2008]
single_temperature=~174 K13 Egeria (pronEng|
ɪˈdʒɪəriə respell|i|JEER|ee-ə, _la. Æge?ria) is a largeMain belt G-typeasteroid . [cite web|url=http://www.lpi.usra.edu/meetings/LPSC98/pdf/1310.pdf|title=HIGH-RESOLUTION 2.5–3.5 �M OBSERVATIONS OF C-, B- AND G-CLASS ASTEROIDS.|last=Rivkin|first=A. S.|coauthors=J. K. Davies, S. L. Ellison, L. A. Lebofsky|accessdate=2008-04-20]It was discovered by A. de Gasparis on November 2, 1850, and was named by
Urbain J. J. Le Verrier , whose computations led to the discovery of Neptune. Egeria was agoddess (other sources say anymph ) ofAricia , inItaly , and the wife ofNuma Pompilius , second king ofRome .Egeria occulted a
star on January 8, 1992. The former's disc was determined to be quite circular (217×196 km).References
Wikimedia Foundation. 2010.