349 Dembowska

From Wikipedia, the free encyclopedia
Jump to: navigation, search
349 Dembowska
349Dembowska (Lightcurve Inversion).png
A three-dimensional model of 349 Dembowska based on its light curve.
Discovery
Discovered by Auguste Charlois
Discovery date 9 December 1892
Designations
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)
17.41 km/s
306.898°
0° 11m 49.704s / day
Inclination 8.2461°
32.351°
346.225°
Earth MOID 1.65832 AU (248.081 Gm)
Jupiter MOID 2.2624 AU (338.45 Gm)
Jupiter Tisserand parameter 3.257
Physical characteristics
Mean radius
69.885±2.15 km[1]
~140 km[2]
145.23 ± 17.21 km[3]
Mass (3.58 ± 1.03) × 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]
Temperature ~148 K
R[1][2]
5.93[1]

349 Dembowska is a large asteroid of the main belt, discovered on December 9, 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.

Orbiting just below the prominent 7:3 resonance with Jupiter, 349 Dembowska is among the larger 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.

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 October 31, 2006,[8] and on December 5, 2007.[9]

References[edit]

  1. ^ a b c d e f "JPL Small-Body Database Browser: 349 Dembowska (1892 T)". Retrieved 6 May 2016. 
  2. ^ a b c d e Majaess D. J., Tanner J., Savoy J., Sampson B. (2008). 349 Dembowska: A Minor Study of its Shape and Parameters, Minor Planet Bulletin, 35, 88
  3. ^ a b c Carry, B. (December 2012). "Density of asteroids". Planetary and Space Science 73: 98–118. arXiv:1203.4336. Bibcode:2012P&SS...73...98C. doi:10.1016/j.pss.2012.03.009.  See Table 1.
  4. ^ a b "Asteroid Albedos (JPG)". JPL Small-Body Database Search Engine. Retrieved 2008-05-02.  External link in |publisher= (help)
  5. ^ Charlois, A.; Benennung von kleinen Planeten, Astronomische Nachrichten, Vol. 132, No. 3155, p. 175
  6. ^ Expanding the Spectral Compositional Information of Asteroid 349 Dembowska
  7. ^ Gradie, J.; Flynn, L. (March 1988). "A Search for Satellites and Dust Belts Around Asteroids: Negative Results". Abstracts of the Lunar and Planetary Science Conference 19: 405–406. Bibcode:1988LPI....19..405G. 
  8. ^ "OCCULTATION BY (349) DEMBOWSKA - 2006 OCT 31". Royal Astronomical Society of New Zealand. 
  9. ^ "349 Dembowska – UCAC2 42014653 (Occultation 2007-12-05 22:43UT)" (PDF). Retrieved 2007-09-22. 

External links[edit]