28 Bellona

28 Bellona  

Bellona (apmag 11.8) near a mag 12 star and background galaxies
Discovery
Discovered by	R. Luther
Discovery date	March 1, 1854
Designations
Alternate name(s)	1951 CC2
Minor planet category	Main belt
Orbital characteristics
Epoch June 14, 2006 (JD 2453900.5)
Aphelion	477.240 Gm (3.190 AU)
Perihelion	353.977 Gm (2.366 AU)
Semi-major axis	415.608 Gm (2.778 AU)
Eccentricity	0.148
Orbital period	1691.362 d (4.63 a)
Average orbital speed	17.77 km/s
Mean anomaly	353.997°
Inclination	9.401°
Longitude of ascending node	144.503°
Argument of perihelion	342.548°
Proper orbital elements
Physical characteristics
Dimensions	97 ± 11 km[1] 120.9 ± 3.4 km (IRAS)[2]
Mass	1.9×1018? kg (assumed)
Mean density	2.0? g/cm³
Equatorial surface gravity	0.0338? m/s²
Escape velocity	0.0639? km/s
Rotation period	15.706 h[2][3]
Albedo	0.1763[2][4]
Temperature	~163 K
Spectral type	S[2]
Absolute magnitude (H)	7.09[2]

28 Bellona ( /bɛˈloʊnə/ be-LOH-nə; Latin: Bellōna) is a large main-belt asteroid.

Bellona was discovered by R. Luther on March 1, 1854. It is named after Bellona, the Roman goddess of war; the name was chosen to mark the beginning of the Crimean War.

Bellona has been studied by radar.^[5]

References

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. http://astro.troja.mff.cuni.cz/projects/asteroids3D/download/durech_et_al_2011_occ_paper.pdf. 
2. ^ ^{a b c d e} "JPL Small-Body Database Browser: 28 Bellona". Jet Propulsion Laboratory. 2012-01-02 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=28. Retrieved 2012-01-28. 
3. ^ http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_DERIVED_LIGHTCURVE_V8_0/data/lc.tab
4. ^ http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_ALBEDOS_V1_1/data/albedos.tab
5. ^ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. http://echo.jpl.nasa.gov/asteroids/. Retrieved 2011-10-30. 

External links

• Orbital simulation from JPL (Java) / Ephemeris
• "Elements and Ephemeris for (28) Bellona". Minor Planet Center. http://scully.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=b2011&o=00028. 

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