511 Davida
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| Image:511 davida.jpg | |
| Discovery | |
|---|---|
| Discovered by: | R. S. Dugan |
| Discovery date: | May 30, 1903 |
| Orbital characteristics | |
| Epoch October 22, 2004 (JD 2453300.5) | |
| Aphelion | 561.538 Gm (3.754 AU) |
| Perihelion: | 385.946 Gm (2.580 AU) |
| Semi-major axis: | 473.742 Gm (3.167 AU) |
| Eccentricity: | 0.185 |
| Orbital period: | 2058.370 d (5.64 a) |
| Avg. orbital speed: | 16.59 km/s |
| Mean anomaly: | 124.997° |
| Inclination: | 15.936° |
| Longitude of ascending node: | 107.683° |
| Argument of perihelion: | 338.694° |
| Physical characteristics | |
| Dimensions: | 326.1 km |
| Mass: | 3.6×1019 kg |
| Mean density: | 2.0 g/cm³ |
| Equatorial surface gravity: | 0.0911 m/s² |
| Escape velocity: | 0.1724 km/s |
| Rotation period: | 0.2137 d 1 |
| Albedo: | 0.054–0.066 2 |
| Temperature: | ~160 K |
| Spectral type: | C |
| Absolute magnitude: | 6.22 |
511 Davida (pronounced /dəˈvɪdə/?) is a large main belt asteroid. It was discovered by R. S. Dugan in 1903. It is thought to be the sixth most massive asteroid after Ceres, Vesta, Pallas, Hygiea, and Interamnia, averaging some 326 km in diameter and comprising an estimated 1.3% of the total mass of the asteroid belt. It is a C-type asteroid, which means that it is dark in colouring with a carbonate composition.
Davida is one of the few main belt asteroids whose shape has been determined by ground-based visual observation. In 2002, astronomers at the Keck Observatory used the Keck II telescope, which is fitted with adaptive optics, to photograph Davida. The image revealed a semi-oblong object with at least two flat facets. Its rotation period is about 5 hours.
Davida is named after David Peck Todd, an astronomy professor at Amherst College.
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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. |
fr:(511) Davida it:511 Davida ja:ダビダ (小惑星) nn:511 Davida pl:511 Davida sk:511 Davida fi:511 Davida sv:511 Davida
