511 Davida
3D model of Davida based on lightcurve modeling
|
|
| Discovery | |
|---|---|
| Discovered by | R. S. Dugan |
| Discovery date | May 30, 1903 |
| Designations | |
| Pronunciation | /dəˈvaɪdə/ or /ˈdævᵻdə/ |
|
Named after
|
David Peck Todd |
| 1903 LU | |
| Main belt | |
| Orbital characteristics | |
| Epoch August 27, 2011 (JD 2455800.5) | |
| Aphelion | 3.756248648 AU |
| Perihelion | 2.57323875 AU |
| 3.164743701 AU | |
| Eccentricity | 0.18690453 |
| 5.63009883 yr (2056.393597 d) | |
|
Average orbital speed
|
16.59 km/s |
| 202.86548° | |
| Inclination | 15.942247° |
| 107.63617° | |
| 338.17810° | |
| Physical characteristics | |
| Dimensions | 289±21 km (357±2 × 294±2 × 231±50) |
| Mass | 3.84±0.20×1019 kg |
|
Mean density
|
2.97±1.30 g/cm³ |
| 0.2137235 d (5.13 h) | |
| Albedo | 0.054–0.066 2 |
| Temperature | ~160 K |
|
Spectral type
|
C |
| 9.50 to 12.98 | |
| 6.22 | |
511 Davida is a large C-type asteroid in the asteroid belt. It was discovered by R. S. Dugan in 1903. It is one of the ten most-massive asteroids, and the 7th-largest asteroid. It is approximately 270–310 km in diameter and comprises an estimated 1.5% of the total mass of the asteroid belt. It is a C-type asteroid, which means that it is dark in colouring with a carbonaceous chondrite composition.
Davida is one of the few main-belt asteroids whose shape has been determined by ground-based visual observation. From 2002 to 2007, astronomers at the Keck Observatory used the Keck II telescope, which is fitted with adaptive optics, to photograph Davida. The asteroid is not a dwarf planet: there are at least two promontories and at least one flat facet with 15-km deviations from a best-fit ellipsoid. The facet is presumably a 150-km global-scale crater like the ones seen on 253 Mathilde. Conrad et al. (2007) show that craters of this size "can be expected from the impactor size distribution, without likelihood of catastrophic disruption of Davida."
Davida is named after David Peck Todd, an astronomy professor at Amherst College.
In 2001, Michalak estimated Davida to have a mass of (6.64±0.56)×1019 kg In 2007, Baer and Chesley estimated Davida to have a mass of (5.9±0.6)×1019 kg. As of 2010[update], Baer suggests Davida has a mass of (3.84±0.20)×1019 kg. This most recent estimate by Baer suggests that Davida is less massive than 704 Interamnia, making Davida the sixth-most-massive asteroid, though the error bars overlap.
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