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Encyclopedia > 13 Egeria


13 Egeria
Discovery
Discoverer Annibale de Gasparis
Discovery Date November 2, 1850
Alternate Designations  
Category Main belt
Orbital Elements
Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e) 0.085
Semi-Major Axis (a) 385.336 Gm (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
Dimensions 207.6 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 (http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm)
Spectral Class G-type asteroid
Absolute Magnitude 6.74
Albedo 0.083 2 (http://dorothy.as.arizona.edu/DSN/IRAS/IMPS/diamalb.html)
Mean Surface Temperature ~240 K

13 Egeria ("e GER ee a") 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).

 This astronomy article is a stub. You can help Wikipedia by expanding it (http://en.wikipedia.org/w/index.php?title=13_Egeria&action=edit).


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The Minor Planets
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(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)
(For a complete listing, see: List of asteroids)



  Results from FactBites:
 
13 Egeria - definition of 13 Egeria in Encyclopedia (143 words)
13 Egeria ("e GER ee a") is a large Main belt asteroid.
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.
  More results at FactBites »


 
 

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