- 423 Diotima
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423 Diotima DiscoveryDiscovered by Auguste Charlois Discovery date December 7, 1896 DesignationsNamed after Diotima of Mantinea Alternate name(s) 1896 DB Minor planet
categoryMain belt (Eos) Epoch 30 January 2005 (JD 2453400.5) Aphelion 477.421 Gm (3.191 AU) Perihelion 439.945 Gm (2.941 AU) Semi-major axis 458.683 Gm (3.066 AU) Eccentricity 0.041 Orbital period 1960.969 d (5.37 a) Average orbital speed 17.01 km/s Mean anomaly 179.514° Inclination 11.24° Longitude of ascending node 69.564° Argument of perihelion 207.473° Physical characteristicsDimensions 208.7 km (IRAS)[1]
171 x 138 km[2]Mass 1.6×1019 kg[3][4]
≈5.1×1018? kg[5]Mean density unknown Equatorial surface gravity unknown Escape velocity unknown Rotation period 4.775 h[1] Albedo 0.05[1] Temperature unknown Spectral type C[1] Absolute magnitude (H) 7.24[1] 423 Diotima (
/daɪ.əˈtaɪmə/ dy-ə-ty-mə; or as in Latin Diotīma, from Greek Διοτίμα) is a one of the largest main-belt asteroids. It is classified as a C-type asteroid[1] and is probably composed of primitive carbonaceous material.It was discovered by Auguste Charlois on December 7, 1896, in Nice. It is named for a priestess who was one of Socrates's teachers. It is one of seven of Charlois's discoveries that was expressly named by the Astromomisches Rechen-Institut (Astronomical Calculation Institute).[6]
In the late 1990s, a network of astronomers worldwide gathered lightcurve data that was ultimately used to derive the spin states and shape models of 10 new asteroids, including 423 Diotima.[7][8]
Dunham (2002) used 15 chords and obtained an estimated size of 171 x 138 km.[2]
References
- ^ a b c d e f "JPL Small-Body Database Browser: 423 Diotima (1896 DB)". 2008-09-09 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=423. Retrieved 2008-11-10.
- ^ a b Vasundhara, R; Kuppuswamy, Ramamoorthy, Velu, Venkataramana (2006). "Occultation of 2UCAC 42376428 by (423) Diotima on 2005 March 06". Astronomical Society of India 34: 21–26. http://hdl.handle.net/2248/1850. Retrieved 2008-11-30.
- ^ Michalak, G. (2001). "Determination of asteroid masses". Astronomy & Astrophysics 374 (2): 703–711. Bibcode 2001A&A...374..703M. doi:10.1051/0004-6361:20010731. http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2001/29/aa10228/aa10228.html. Retrieved 2008-11-10.
- ^ Michalak2001 assumed masses of perturbing asteroids used in calculations of perturbations of the test asteroids.
- ^ Using the volume of an ellipsoid of 209x171x138km * an assumed density of 2 g/cm³ yields a mass (m=d*v) of 5.1E+18 kg
- ^ Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.
- ^ Durech., J.; Kaasalainen, M., Marciniak, A.; et al., “Physical models of ten asteroids from an observers' collaboration network”, Astronomy and Astrophysics, Volume 465, Issue 1, April I 2007, pp. 331-337
- ^ Durech, J.; Kaasalainen, M.; Marciniak, A.; Allen, W. H. et al. “Asteroid brightness and geometry,” Astronomy and Astrophysics, Volume 465, Issue 1, April I 2007, pp. 331-337.
External links
- Orbital simulation from JPL (Java) / Ephemeris
Minor planets navigator Small Solar System bodies Minor planets - Designation
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Comets Meteoroids Lists / categories - Asteroid groups and families
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- Minor planets
Categories:- Eos asteroids
- C-type asteroids
- Asteroids named for people
- Astronomical objects discovered in 1896
- Discoveries by Auguste Charlois
- C-type Main Belt asteroid stubs
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