| Discovery | |
|---|---|
| Discovered by: | Annibale de Gasparis |
| Discovery date: | November 2, 1850 |
| Orbital characteristics | |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 417.953 Gm (2.794 AU) |
| Perihelion: | 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 (pronounced /ɪˈdʒɪəriə/, Latin: Æge?ria) 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).
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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| Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Neptune Trojans · Comets · Trans-Neptunians (Kuiper belt • Scattered disc objects • Oort cloud) |
| For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons, meteoroids and the Solar System. For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names. |
