349 Dembowska

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349 Dembowska
349Dembowska (Lightcurve Inversion).png
A three-dimensional model of 349 Dembowska based on its light curve
Discovery
Discovered by Auguste 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 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
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]

    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.

    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]

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    References

    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 349 Dembowska (1892 T)". Archived from the original on 15 January 2017. Retrieved 6 May 2016.
    2. 1 2 3 4 5 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. 1 2 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. 1 2 "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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