28 Bellona

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28 Bellona 28 Bellona symbol.svg
28Bell-LB1-mag12.jpg
Bellona (apmag 11.8) near a mag 12 star and background galaxies
Discovery
Discovered by R. Luther
Discovery date March 1, 1854
Designations
Pronunciation /bɛˈlnə/ be-LOH-nə
1951 CC2
Minor planet category Main belt
Orbital characteristics
Epoch Sept 30, 2012 (JD 2456200.5)
Aphelion 477.240 Gm (3.196 AU)
Perihelion 353.977 Gm (2.358 AU)
415.608 Gm (2.777 AU)
Eccentricity 0.151
1690.19 d (4.63 a)
17.77 km/s
121.574°
Inclination 9.430°
144.330°
344.461°
Physical characteristics
Dimensions 97 ± 11 km[1]
120.9 ± 3.4 km (IRAS)[2]
108.10 ± 11.49[3] km
Mass (2.62 ± 0.15) × 1018[3] kg
Mean density
3.95 ± 1.28[3] g/cm3
0.0338? m/s²
0.0639? km/s
15.706 h[2][4]
Albedo 0.1763[2][5]
Temperature ~163 K
Spectral type
S[2]
7.09[2]

28 Bellona is a large main-belt asteroid. It was discovered by R. Luther on March 1, 1854, and named after Bellōna, the Roman goddess of war; the name was chosen to mark the beginning of the Crimean War.

Bellona has been studied by radar.[6] Photometric observations of this asteroid at the Palmer Divide Observatory in Colorado Springs, Colorado in 2007 gave a light curve with a period of 15.707 ± 0.002 hours and a brightness variation of 0.27 ± 0.03 in magnitude. This report is in close agreement with a period estimate of 15.695 hours reported in 1983, and rejects a longer period of 16.523 hours reported in 1979.[7]

References[edit]

  1. ^ Ďurech, Josef; Kaasalainen, Mikko; Herald, David; Dunham, David; Timerson, Brad; Hanuš, Josef; Frappa, Eric; Talbot, John; Hayamizu, Tsutomu; Warner, Brian D.; Pilcher, Frederick; Galád, Adrián (2011). "Combining asteroid models derived by lightcurve inversion with asteroidal occultation silhouettes". Icarus 214 (2): 652–670. arXiv:1104.4227. Bibcode:2011Icar..214..652D. doi:10.1016/j.icarus.2011.03.016. 
  2. ^ a b c d e "JPL Small-Body Database Browser: 28 Bellona". Jet Propulsion Laboratory. 2012-01-02 last obs. Retrieved 2012-01-28. 
  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. ^ http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_DERIVED_LIGHTCURVE_V8_0/data/lc.tab
  5. ^ http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_ALBEDOS_V1_1/data/albedos.tab
  6. ^ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2011-10-30. 
  7. ^ Warner, Brian D. (December 2007), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory - March-May 2007", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 34 (4): 104–107, Bibcode:2007MPBu...34..104W. 

External links[edit]