511 Davida

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
Asteroid 511 Davida imaged by the Keck Observatory, December 2002.


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