511 Davida
|
|
| Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html) | |
|---|---|
| Discoverer | R. S. Dugan |
| Discovery date | May 30, 1903 |
| Alternate designations | 1903 LU B (http://cfa-www.harvard.edu/iau/MPDes.html) |
| Category | Main belt |
| Orbital elements C (http://asteroid.lowell.edu/) Epoch October 22, 2004 (JD 2453300.5) | |
| Eccentricity (e) | 0.185 |
| Semi-major axis (a) | 473.742 Gm (3.167 AU) |
| Perihelion (q) | 385.946 Gm (2.580 AU) |
| Aphelion (Q) | 561.538 Gm (3.754 AU) |
| Orbital period (P) | 2058.370 d (5.64 a) |
| Mean orbital speed | 16.59 km/s |
| Inclination (i) | 15.936° |
| Longitude of the ascending node (Ω) | 107.683° |
| Argument of perihelion (ω) | 338.694° |
| Mean anomaly (M) | 124.997° |
| Physical characteristics | |
| Dimensions | 326.1 km |
| Mass | 3.6×1019 kg |
| Density | 2.0 g/cm³ |
| Surface gravity | 0.0911 m/s² |
| Escape velocity | 0.1724 km/s |
| Rotation period | 0.2137 d 1 (http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm) |
| Spectral class | C |
| Absolute magnitude | 6.22 |
| Albedo | 0.054–0.066 2 (http://www.psi.edu/pds/archive/astdata/ALBEDOS/albedos.tab) |
| Mean surface temperature | ~160 K |
511 Davida is a main belt asteroid. It was discovered by R. S. Dugan in 1903. It is one of the largest asteroids, measuring 326 km in diameter, and 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.
Missing image
511_davida.jpg
511_davida.jpg
Asteroid 511 Davida imaged by the Keck Observatory, December 2002.
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