23 Thalia
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Discovery
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| Discovered by | J. R. Hind |
| Discovery date | December 15, 1852 |
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Designations
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| Pronunciation | English pronunciation: /θəˈlaɪ.ə/ |
| Named after | Thalia |
| Alternate name(s) | 1938 CL; 1974 QT2 |
| Minor planet category |
Main belt |
| Epoch June 14, 2006 (JD 2453900.5) | |
| Aphelion | 484.663 Gm (3.240 AU) |
| Perihelion | 301.483 Gm (2.015 AU) |
| Semi-major axis | 393.073 Gm (2.628 AU) |
| Eccentricity | 0.233 |
| Orbital period | 1555.679 d (4.26 a) |
| Average orbital speed | 18.12 km/s |
| Mean anomaly | 328.687° |
| Inclination | 10.145° |
| Longitude of ascending node | 67.228° |
| Argument of perihelion | 59.311° |
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Physical characteristics
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| Dimensions | 107.5 km |
| Mass | 1.3×1018? kg |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | 0.0300? m/s² |
| Escape velocity | 0.0568? km/s |
| Rotation period | 0.5128 d (12.308 h) [1] |
| Albedo | 0.2536 (geometric)[2] |
| Temperature | ~164 K |
| Spectral type | S |
| Apparent magnitude | 9.11 to 13.19 |
| Absolute magnitude (H) | 6.95 |
23 Thalia (Greek: Θάλεια) 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.[3] Bishop named it after Thalia, the Muse of comedy and pastoral poetry in Greek mythology.[4]
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 a/b ratio of 1.28 ± 0.05.[5]
With a semimajor axis of 2.628, the asteroid is orbiting between the 3:1 and 5:2 Kirkwood gaps in the main belt.[6] 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.[7]
Thalia has been studied by radar.[8]
[edit] References
- ^ "Asteroid Lightcurve Paramaters". Planetary Science Institute. Archived from the original on 2006-06-14. http://web.archive.org/web/20060614093519/http://www.psi.edu/pds/archive/lc.html. Retrieved 2008-11-03.
- ^ "Albedos Data Table". Planetary Science Institute. http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_ALBEDOS_V1_1/data/albedos.tab. Retrieved 2008-11-03.[dead link]
- ^ Hand-books of natural philosophy and astronomy. 3. Philadelphia: Blanchard and Lea. 1858. p. 315. http://books.google.com/books?id=93IAAAAAMAAJ. Retrieved 2009-11-10.
- ^ Schmadel, Lutz D. (2003). Dictionary of minor planet names (5th ed.). Springer. p. 17. ISBN 3-540-00238-3.
- ^ Lagerkvist, C.-I.; et al. (October 1995). "Physical studies of asteroids. XXIX. Photometry and analysis of 27 asteroids". Astronomy and Astrophysics Supplement 113: 115–122. Bibcode 1995A&AS..113..115L.
- ^ Yeomans, Donald K.. "Asteroid Main-Belt Distribution". NASA/Jet Propulsion Laboratoty. http://ssd.jpl.nasa.gov/?histo_a_ast. Retrieved 2009-11-10.
- ^ Williams, Gareth (April 3, 2007). "Distribution of the Minor Planets". Minor Planets Center. http://cfa-www.harvard.edu/iau/lists/MPDistribution.html. Retrieved 2007-04-15.
- ^ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. http://echo.jpl.nasa.gov/asteroids/. Retrieved 2011-10-30.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
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