13 Egeria
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| Discovery | |
|---|---|
| Discovered by: | Annibale de Gasparis |
| Discovery date: | November 2, 1850 |
| Alternative names: | none |
| Minor planet category: | Main belt |
| Orbital characteristics | |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion distance: | 417.953 Gm (2.794 AU) |
| Perihelion distance: | 352.719 Gm (2.358 AU) |
| Semi-major axis: | 385.336 Gm (2.576 AU) |
| Eccentricity: | 0.085 |
| Orbital period: | 1509.977 d (4.13 a) |
| Avg. orbital speed: | 18.56 km/s |
| Mean anomaly: | 339.787° |
| Inclination: | 16.540° |
| Longitude of ascending node: | 43.305° |
| Argument of perihelion: | 81.401° |
| Physical characteristics | |
| Dimensions: | 207.6 km (217×196 km) |
| Mass: | ~9.4×1018 kg |
| Mean density: | 2 ? g/cm³ |
| Equatorial surface gravity: | ~0.0580 m/s² |
| Escape velocity: | ~0.1098 km/s |
| Rotation period: | 0.2935 d [1] |
| Albedo: | 0.083 [2] |
| Temperature: | ~174 K |
| Spectral type: | G-type asteroid |
| Absolute magnitude: | 6.74 |
13 Egeria (IPA: [ɪˈdʒiɹiə]) 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
[edit] References
- ^ http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm
- ^ http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab
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|---|---|---|
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| List of asteroids | ||
Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Comets · Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud)
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.
