[[1]]
≈5.1{{e|18}}? kg[2]
{{nowrap|(6.91 ± 1.93) × 1018 kg[3]}}
| density=1.39 ± 0.50 g/cm3[3]
| rotation={{Convert|4.775|h|d|abbr=on|lk=on}}[1]
| spectral_type=C[1]
| abs_magnitude=7.24[1]
| albedo={{val|0.0515|0.003}}[1]
| mean_motion={{Deg2DMS|0.183432|sup=ms}} / day
| orbit_ref=[1]
| observation_arc=116.96 yr (42719 d)
| uncertainty=0
}}Diotima (minor planet designation: 423 Diotima) is one of the larger 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. 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.[15][3] Dunham (2002) used 15 chords and obtained an estimated size of 171 x 138 km.[4]
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).[5]
The name is stressed on the penultimate syllable, {{IPAc-en|d|aɪ|.|ə|ˈ|t|aɪ|m|ə}} {{Respell|dy-ə|TY|mə}}, as in Latin Diotīma.
References
1. ^Michalak2001 assumed masses of perturbing asteroids used in calculations of perturbations of the test asteroids.
2. ^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
3. ^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.
4. ^1 {{cite journal |last=Vasundhara |first=R |author2=Kuppuswamy, Ramamoorthy |author3=Velu, Venkataramana |title=Occultation of 2UCAC 42376428 by (423) Diotima on 2005 March 06 |journal=Astronomical Society of India |volume=34 |pages=21–26 |date=2006 |url=http://hdl.handle.net/2248/1850 |accessdate=2008-11-30 }}
5. ^Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. {{ISBN|3-540-00238-3}}.
6. ^1 2 3 4 5 6 7 {{cite web |type=2008-09-09 last obs |title=JPL Small-Body Database Browser: 423 Diotima (1896 DB) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=423 |accessdate=6 May 2016}}
7. ^1 2 3 {{Citation | first1 = B. | last1 = Carry | title = Density of asteroids | work = Planetary and Space Science | volume = 73 | pages = 98–118 |date=December 2012 | doi = 10.1016/j.pss.2012.03.009 | bibcode = 2012P&SS...73...98C | postscript= .|arxiv = 1203.4336 }} See Table 1.
8. ^1 {{Citation | last1 = Durech | first1 = J. | last2 = Kaasalainen | first2 = M. | last3 = Marciniak | first3 = A. | display-authors = 1 | title = Physical models of ten asteroids from an observers' collaboration network | work = Astronomy and Astrophysics | volume = 465 | issue = 1 | pages = 331–337 |date=April 2007 | doi = 10.1051/0004-6361:20066347 | bibcode = 2007A&A...465..331D | postscript= .}}
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