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Diotima (minor planet designation: 423 Diotima) is one of the larger main-belt asteroids. It is classified as a C-type asteroid[2] and is probably composed of primitive carbonaceous material.

423 Diotima
A three-dimensional model of 423 Diotima based on its light curve
Discovery
Discovered byAuguste Charlois
Discovery date7 December 1896
Designations
MPC designation
(423) Diotima
Pronunciation/daɪ.əˈtaɪmə/[1]
Named after
Diotima of Mantinea (Διοτίμα Diotīma)
Alternative designations
1896 DB
Minor planet category
Main belt
AdjectivesDiotimean /daɪ.ɒtəˈmiːən/
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc116.96 yr (42719 d)
Aphelion3.18523 AU (476.504 Gm)
Perihelion2.95026 AU (441.353 Gm)
Semi-major axis
3.06774 AU (458.927 Gm)
Eccentricity0.038297
Orbital period (sidereal)
5.37 yr (1962.6 d)
Mean anomaly
237.495°
Mean motion
0° 11m 0.355s / day
Inclination11.2304°
Longitude of ascending node
69.4710°
Argument of perihelion
200.103°
Physical characteristics
Dimensions208.8 ± 4.9 km (IRAS)[2]
171 x 138 km[3]
211.64 ± 16.02 km[4]
Mean radius
104.385±2.45 km
Mass(6.91 ± 1.93) × 1018 kg[4]
Mean density
1.39 ± 0.50 g/cm3[4]
Synodic rotation period
4.775 h (0.1990 d)[2]
Geometric albedo
0.0515±0.003[2]
Spectral type
C[2]
Absolute magnitude (H)
7.24[2]

    It was discovered by Auguste Charlois on 7 December 1896, in Nice. 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. The light curve for this asteroid varies "a lot" depending on the position, with the brightness variations ranging from almost zero to up to 0.2 in magnitude.[5][6] Dunham (2002) used 15 chords and obtained an estimated size of 171 x 138 km.[3]


    Name


    Diotima is named for Diotima of Mantinea, 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).[7]

    The name is stressed on the penultimate syllable, /daɪ.əˈtaɪmə/ dy-ə-TY-mə, as in Latin Diotīma.


    References


    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. "JPL Small-Body Database Browser: 423 Diotima (1896 DB)" (2008-09-09 last obs). Retrieved 6 May 2016.
    3. 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. Retrieved 30 November 2008.
    4. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    5. Durech, J.; et al. (April 2007), "Physical models of ten asteroids from an observers' collaboration network", Astronomy and Astrophysics, 465 (1): 331–337, Bibcode:2007A&A...465..331D, doi:10.1051/0004-6361:20066347.
    6. 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.
    7. Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.



    На других языках

    [de] (423) Diotima

    (423) Diotima ist ein Asteroid des Hauptgürtels, der am 7. Dezember 1896 von dem französischen Astronomen Auguste Charlois in Nizza entdeckt wurde.
    - [en] 423 Diotima

    [es] (423) Diotima

    (423) Diotima es un asteroide perteneciente al cinturón de asteroides descubierto el 7 de diciembre de 1896 por Auguste Honoré Charlois desde el observatorio de Niza, Francia. Está nombrado en honor de Diotima, un personaje de la obra de Platón El banquete.[2]

    [ru] (423) Диотима

    (423) Диотима (греч. Διοτίμα) — крупный астероид главного пояса, который по мнению астрономов, входить в состав семейства Эос, поскольку обладает сходными параметрами орбиты и, так же как и астероиды этого семейства, относится к тёмному спектральному классу C, богатому углеродными соединениями.


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