23 Thalia: Difference between revisions
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==External links== |
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*[http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=23 JPL Ephemeris] |
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{{Minor planets navigator|22 Kalliope|24 Themis}} |
{{Minor planets navigator|22 Kalliope|24 Themis}} |
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Revision as of 03:34, 22 December 2013
| Discovery | |
|---|---|
| Discovered by | J. R. Hind |
| Discovery date | December 15, 1852 |
| Designations | |
| Pronunciation | /θəˈlaɪ.ə/ thə-LY-ə |
Named after | Thalia |
| 1938 CL; 1974 QT2 | |
| Main belt | |
| Orbital characteristics | |
| Epoch June 14, 2006 (JD 2453900.5) | |
| Aphelion | 484.663 Gm (3.240 AU) |
| Perihelion | 301.483 Gm (2.015 AU) |
| 393.073 Gm (2.628 AU) | |
| Eccentricity | 0.233 |
| 1555.679 d (4.26 a) | |
Average orbital speed | 18.12 km/s |
| 328.687° | |
| Inclination | 10.145° |
| 67.228° | |
| 59.311° | |
| Physical characteristics | |
| Dimensions | 107.5 ± 2.2 km (IRAS)[1] 106.81 ± 3.23[2] km |
| Mass | (1.96 ± 0.09) × 1018[2] kg |
Mean density | 3.07 ± 0.31[2] g/cm3 |
| 0.0300? m/s² | |
| 0.0568? km/s | |
| 12.312 h[1] | |
| Albedo | 0.2536 (geometric)[3] |
| Temperature | ~164 K |
Spectral type | S[1] |
| 9.11 to 13.19 | |
| 6.95[1] | |
23 Thalia[4] is a large main-belt asteroid. It was discovered by J. R. Hind on December 15, 1852, at the private observatory of W. Bishop, located in Hyde Park, London, England.[5] Bishop named it after Thalia, the Muse of comedy and pastoral poetry in Greek mythology.[6]
It is categorized as an S-type asteroid consisting of mainly of iron- and magnesium-silicates. This the second most common type of asteroid in the main belt. Based on analysis of the light curve, the object has a sidereal rotation period of 0.513202 ± 0.000002 days. An ellipsoidal model of the light curve gives an /b ratio of 1.28 ± 0.05.[7]
With a semimajor axis of 2.628, the asteroid is orbiting between the 3:1 and 5:2 Kirkwood gaps in the main belt.[8] Its orbital eccentricity is larger than the median value of 0.07 for the main belt, and the inclination is larger than the median of below 4°. But most of the main-belt asteroids have an eccentricity of no more than 0.4 and an inclination of up to 30°, so the orbit of 23 Thalia is not unusual for a main-belt asteroid.[9]
Thalia has been studied by radar.[10]
References
- ^ a b c d "JPL Small-Body Database Browser: 23 Thalia". Jet Propulsion Laboratory. 2011-04-30 last obs. Retrieved 2012-01-28.
{{cite web}}: Check date values in:|date=(help) - ^ a b c Carry, B. (2012), "Density of asteroids", Planetary and Space Science, vol. 73, p. 98-118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.
{{citation}}: Unknown parameter|month=ignored (help) See Table 1. - ^ "Albedos Data Table". Planetary Science Institute. Retrieved 2008-11-03.
- ^ Stressed on the second syllable, /θəˈlaɪ.ə/ thə-LY-ə.
- ^ Hand-books of natural philosophy and astronomy. Vol. 3. Philadelphia: Blanchard and Lea. 1858. p. 315. Retrieved 2009-11-10.
{{cite book}}:|first=missing|last=(help) - ^ Schmadel, Lutz D. (2003). Dictionary of minor planet names (5th ed.). Springer. p. 17. ISBN 3-540-00238-3.
- ^ Lagerkvist, C.-I. (1995). "Physical studies of asteroids. XXIX. Photometry and analysis of 27 asteroids". Astronomy and Astrophysics Supplement. 113: 115–122. Bibcode:1995A&AS..113..115L.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|month=ignored (help) - ^ Yeomans, Donald K. "Asteroid Main-Belt Distribution". NASA/Jet Propulsion Laboratoty. Retrieved 2009-11-10.
- ^ Williams, Gareth (April 3, 2007). "Distribution of the Minor Planets". Minor Planets Center. Archived from the original on 21 March 2007. Retrieved 2007-04-15.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2011-10-30.