Astronomy:349 Dembowska
.png) 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 | /dɛmˈbaʊskə/ |
| Named after | Ercole Dembowski |
| 1892 T | |
| Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 123.32 yr (45044 d) |
| |{{{apsis}}}|helion}} | 3.1912 astronomical unit|AU (477.40 Gm) |
| |{{{apsis}}}|helion}} | 2.65635 AU (397.384 Gm) |
| 2.92379 AU (437.393 Gm) | |
| Eccentricity | 0.091473 |
| Orbital period | 5.00 yr (1826.1 d) |
| Mean anomaly | 306.898° |
| Mean motion | 0° 11m 49.704s / day |
| Inclination | 8.2461° |
| Longitude of ascending node | 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) × 1018 kg[3] |
| Mean density | 2.23 ± 1.01 g/cm3[3] |
| Rotation period | 4.701 h (0.1959 d)[1] 4.701207 ± 0.000058 h[2] |
| Geometric albedo | 0.384 (Bright)[4] 0.3840±0.025[1] |
| R[1][2] | |
| Absolute magnitude (H) | 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]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "JPL Small-Body Database Browser: 349 Dembowska (1892 T)". https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=349.
- ↑ 2.0 2.1 2.2 2.3 2.4 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
- ↑ 3.0 3.1 3.2 Carry, B. (December 2012). "Density of asteroids". Planetary and Space Science 73: 98–118. doi:10.1016/j.pss.2012.03.009. Bibcode: 2012P&SS...73...98C. See Table 1.
- ↑ 4.0 4.1 "Asteroid Albedos (JPG)". JPL Small-Body Database Search Engine. http://home.surewest.net/kheider/astro/albedo.jpg.
- ↑ Charlois, A.; Benennung von kleinen Planeten, Astronomische Nachrichten, Vol. 132, No. 3155, p. 175
- ↑ Expanding the Spectral Compositional Information of Asteroid 349 Dembowska
- ↑ 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.
- ↑ "OCCULTATION BY (349) DEMBOWSKA - 2006 OCT 31". Royal Astronomical Society of New Zealand. http://occsec.wellington.net.nz/planet/2006/updates/061031_349_5642_u.htm.
- ↑ "349 Dembowska – UCAC2 42014653 (Occultation 2007-12-05 22:43UT)". http://mpocc.astro.cz/2007/a07_12054.pdf.
External links
- 349 Dembowska at AstDyS-2, Asteroids—Dynamic Site
- 349 Dembowska at the JPL Small-Body Database
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