13 Egeria

**13 Egeria**
Discovery ^A

Discoverer	Annibale de Gasparis
Discovery date	November 2, 1850
Alternate designations ^B	none
Category	Main belt
Orbital elements ^C
Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e)	0.085
Semi-major axis (a)	385.336 G m (2.576 AU)
Perihelion (q)	352.719 Gm (2.358 AU)
Aphelion (Q)	417.953 Gm (2.794 AU)
Orbital period (P)	1509.977 d (4.13 a)
Mean orbital speed	18.56 km/s
Inclination (i)	16.540°
Longitude of the ascending node (Ω)	43.305°
Argument of perihelion (ω)	81.401°
Mean anomaly (M)	339.787°
Physical characteristics ^D
Dimensions	207.6 km (217×196 km)
Mass	9.4×10¹⁸ kg
Density	2 ? g/cm³
Surface gravity	0.0580 m/s²
Escape velocity	0.1098 km/s
Rotation period	0.2935 d 1
Spectral class	G-type asteroid
Absolute magnitude	6.74
Albedo (geometric)	0.083 2
Mean surface temperature	~174 K
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13 Egeria (i-jeer'-ee-ə (key)) is a large Main belt asteroid.

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 a goddess (other sources say a nymph) of Aricia, in Italy, and the wife of Numa Pompilius, second king of Rome.

Egeria occulted a star on January 8, 1992. The former's disc was determined to be quite circular (217×196 km).

[edit] Aspects

Stationary, retrograde	Opposition	Distance to Earth (AU)	Maximum brightness (mag)	Stationary, prograde	Conjunction to Sun
January 28, 2005	March 9, 2005	1.46354	10.1	May 4, 2005	November 12, 2005
May 13, 2006	June 30, 2006	1.79865	10.8	August 20, 2006	February 16, 2007
August 24, 2007	October 12, 2007	1.63321	10.3	December 7, 2007	June 6, 2008
January 12, 2008	February 18, 2009	1.45033	10.1	April 13, 2009	October 28, 2009
April 27, 2010	June 16, 2010	1.75535	10.6	August 5, 2010	February 3, 2011
August 11, 2011	September 28, 2011	1.69634	10.5	November 24, 2011	May 19, 2012
December 24, 2012	January 29, 2013	1.44202	10.1	March 20, 2013	October 13, 2013
April 11, 2014	June 3, 2014	1.70259	10.5	July 23, 2014	January 21, 2015
July 30, 2015	September 14, 2015	1.75342	10.7	November 12, 2015	May 3, 2016
December 2, 2016	January 9, 2017	1.43782	10.1	February 24, 2017	September 26, 2017
March 28, 2018	May 20, 2018	1.64527	10.2	July 10, 2018	January 8, 2019
July 18, 2019	August 31, 2019	1.79902	10.8	October 29, 2019	April 17, 2020
November 8, 2020	December 21, 2020	1.44185	10.0	April 6, 2020	October 11, 2020

Minor planets
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For other objects and regions, see: asteroid groups and families, binary asteroids, asteroid moons and the Solar system For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.