423 Diotima

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**423 Diotima**
Discovery ^A

Discoverer	Auguste Charlois
Discovery date	December 7, 1896
Alternate designations ^B	1896 DB
Category	Main belt (Eos)
Orbital elements ^C
Epoch 30 January 2005 (JD 2453400.5)
Eccentricity (e)	0.041
Semi-major axis (a)	458.683 G m (3.066 AU)
Perihelion (q)	439.945 Gm (2.941 AU)
Aphelion (Q)	477.421 Gm (3.191 AU)
Orbital period (P)	1960.969 d (5.37 a)
Mean orbital speed	17.01 km/s
Inclination (i)	11.24°
Longitude of the ascending node (Ω)	69.564°
Argument of perihelion (ω)	207.473°
Mean anomaly (M)	179.514°
Physical characteristics ^D
Dimensions	209.0 km
Mass	unknown
Density	unknown
Surface gravity	unknown
Escape velocity	unknown
Rotation period	unknown
Spectral class	C
Absolute magnitude	7.24
Albedo (geometric)	unknown
Mean surface temperature	unknown
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423 Diotima (dye'-ə-tye'-mə, IPA: /ˈdaɪəˈtaɪmə/; Latin Diotīma, from Greek) is a one of the largest Main belt asteroids. It is classified as a C-type asteroid and is probably composed of primitive carbonaceous material.^{[citation needed]}

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). ^[1]

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. ^[2]^[3]

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[edit] References

^ Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN-10: 3540002383.
^ 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.