13 Egeria
|
|
| Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html) | |
|---|---|
| Discoverer | Annibale de Gasparis |
| Discovery date | November 2, 1850 |
| Alternate designations | B (http://cfa-www.harvard.edu/iau/MPDes.html) |
| Category | Main belt |
| Orbital elements C (http://asteroid.lowell.edu/) 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 | ~178 K |
13 Egeria (e-jeer'-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).
Template:Asteroid-stub
... | Previous asteroid | 13 Egeria | Next asteroid | ...
| The minor planets |
| Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans |
| Centaurs | Trans-Neptunians | Damocloids | Comets | Kuiper belt | Oort cloud |
| (For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system) |
| (For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.) |