349 Dembowska

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349 Dembowska
Discovery A
Discoverer Auguste Charlois
Discovery date December 9, 1892
Alternate
designations B		 1892 T
Category Main belt
Orbital elements C
Epoch 30 January 2005 (JD 2453400.5)
Eccentricity (e) 0.087
Semi-major axis (a) 437.812 Gm (2.927 AU)
Perihelion (q) 399.743 Gm (2.672 AU)
Aphelion (Q) 475.88 Gm (3.181 AU)
Orbital period (P) 1828.662 d (5.00 a)
Mean orbital speed 17.41 km/s
Inclination (i) 8.256°
Longitude of the
ascending node (Ω)		 32.5°
Argument of
perihelion (ω)		 347.171°
Mean anomaly (M) 198.148°
Physical characteristics D
Dimensions ~140 km[1][2]
Mass unknown
Density unknown
Surface gravity unknown
Escape velocity unknown
Rotation period 4.701207 ± 0.000058 h[2][1]
Spectral class R[2][1]
Absolute magnitude 5.93[1]
Albedo (geometric) 0.384 (Bright)[1][3]
Mean surface
temperature		 ~148 K
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Asteroid 349 Dembowska is named in honor of the Baron Hercules Dembowski, an Italian astronomer who made significant contributions to research on double and multiple stars. The asteroid was discovered over a century ago on December 9, 1892, by the French astronomer Auguste Charlois while working at the observatory in Nice, France.[4] Located just prior to 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 due to the presence of strong absorption lines in olivine and pyroxene with little or no metals.

349 Dembowska is a large main belt asteroid with 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.[3]

It is classified as an R-type asteroid and may have undergone partial melting/differentiation.[5]

Dembowska and 16 Psyche have orbits that repeat themselves almost exactly every five years in respect to their position to the Sun and Earth.

There was on occultation on October 31, 2006,[6] and on December 5, 2007.[7]

[edit] References

  1. ^ a b c d e JPL Small-Body Database Browser: 349 Dembowska (1892 T). Retrieved on 2008-05-02.
  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 Asteroid Albedos (JPG). JPL Small-Body Database Search Engine. Retrieved on 2008-05-02.
  4. ^ Charlois, A.; Benennung von kleinen Planeten, Astronomische Nachrichten, Vol. 132, No. 3155, p. 175
  5. ^ Expanding the Spectral Compositional Information of Asteroid 349 Dembowska
  6. ^ OCCULTATION BY (349) DEMBOWSKA - 2006 OCT 31. Royal Astronomical Society of New Zealand.
  7. ^ 349 Dembowska – UCAC2 42014653 (Occultation 2007-12-05 22:43UT). Retrieved on 2007-09-22.

[edit] External links

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