349 Dembowska

Dembowska (minor planet designation: 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.

349 Dembowska
A three-dimensional model of 349 Dembowska based on its light curve
Discovery
Discovered byAuguste Charlois
Discovery date9 December 1892
Designations
(349) Dembowska
Pronunciation/dɛmˈbaʊskə/
Named after
Ercole Dembowski
1892 T
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc123.32 yr (45044 d)
Aphelion3.1912 AU (477.40 Gm)
Perihelion2.65635 AU (397.384 Gm)
2.92379 AU (437.393 Gm)
Eccentricity0.091473
5.00 yr (1826.1 d)
306.898°
0° 11m 49.704s / day
Inclination8.2461°
32.351°
346.225°
Physical characteristics
Dimensions139.77±4.3 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]
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.

    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]

    References
    1. "JPL Small-Body Database Browser: 349 Dembowska (1892 T)". Archived from the original on 15 January 2017. Retrieved 6 May 2016.
    2. 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. 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. "Asteroid Albedos (JPG)". JPL Small-Body Database Search Engine. Archived from the original on 22 February 2013. Retrieved 2 May 2008.
    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 Archived 2007-08-30 at the Wayback Machine
    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. Archived from the original on 8 February 2012.
    9. "349 Dembowska – UCAC2 42014653 (Occultation 2007-12-05 22:43UT)" (PDF). Retrieved 22 September 2007.

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