349 Dembowska
Main-belt asteroid
From Wikipedia, the free encyclopedia
349 Dembowska is a large asteroid of the main belt, discovered on 9 December 1892, by the French astronomer Auguste Charlois while working at the observatory in Nice, France.[5] It is named in honor of the Baron Hercules Dembowski, an Italian astronomer who made significant contributions to research on double and multiple stars.
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A three-dimensional model of 349 Dembowska based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 9 December 1892 |
| Designations | |
| (349) Dembowska | |
| Pronunciation | /dÉmËbaÊskÉ/ |
Named after | Ercole Dembowski |
| 1892 T | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 123.32 yr (45044 d) |
| Aphelion | 3.1912 AU (477.40 Gm) |
| Perihelion | 2.65635 AU (397.384 Gm) |
| 2.92379 AU (437.393 Gm) | |
| Eccentricity | 0.091473 |
| 5.00 yr (1826.1 d) | |
| 306.898° | |
| 0° 11m 49.704s / day | |
| Inclination | 8.2461° |
| 32.351° | |
| 346.225° | |
| Physical characteristics | |
| Dimensions | 139.77±4.3 km[1] 140 km[2] 145.23 ± 17.21 km[3] |
| Mass | (3.58 ± 1.03) à 1018 kg[3] |
Mean density | 2.23 ± 1.01 g/cm3[3] |
| 4.701 h (0.1959 d)[1] 4.701207 ± 0.000058 h[2] | |
| 0.384 (Bright)[4] 0.3840±0.025[1] | |
| R[1][2] | |
| 5.93[1] | |
Orbiting just inside the prominent 7:3 resonance with Jupiter, 349 Dembowska is among the largest asteroids in the main belt with an estimated diameter of ~140 km.[2] It has a rotational period of 4.7012 hours,[2] and is classified as an R-type asteroid for the presence of strong absorption lines in olivine and pyroxene with little or no metals. It may have undergone partial melting/differentiation.[6] 349 Dembowska has an unusually high albedo of 0.384. Of the asteroids with a diameter greater than 75 km, only 4 Vesta has a higher known albedo.[4]
Dembowska and 16 Psyche have orbits that repeat themselves almost exactly every five years in respect to their position to the Sun and Earth.[citation needed]
In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty.[7] There was one occultation on 31 October 2006,[8] and on 5 December 2007.[9]
