Astronomy:23 Thalia
.png) A three-dimensional model of 23 Thalia based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | J. R. Hind |
| Discovery date | December 15, 1852 |
| Designations | |
| (23) Thalia | |
| Pronunciation | /θəˈlaɪ.ə/[1] |
| Named after | Thalia |
| 1938 CL; 1974 QT2 | |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch June 14, 2006 (JD 2453900.5) | |
| |{{{apsis}}}|helion}} | 484.663 Gm (3.240 AU) |
| |{{{apsis}}}|helion}} | 301.483 Gm (2.015 AU) |
| 393.073 Gm (2.628 AU) | |
| Eccentricity | 0.233 |
| Orbital period | 1555.679 d (4.26 a) |
| Mean anomaly | 328.687° |
| Inclination | 10.145° |
| Longitude of ascending node | 67.228° |
| 59.311° | |
| Physical characteristics | |
| Dimensions | 107.5 ± 2.2 km (IRAS)[2] 106.81 ± 3.23 km[3] |
| Mass | (1.96 ± 0.09) × 1018 kg[3] |
| Mean density | 3.07 ± 0.31 g/cm3[3] |
| Rotation period | 12.312 h[2] |
| Geometric albedo | 0.2536 (geometric)[4] |
| S [2] | |
| Apparent magnitude | 9.11 to 13.19 |
| Absolute magnitude (H) | 6.95[2] |
Thalia[5] (minor planet designation: 23 Thalia) 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.[6] Bishop named it after Thalia, the Muse of comedy and pastoral poetry in Greek mythology.[7]
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.[8]
With a semimajor axis of 2.628, the asteroid is orbiting between the 3:1 and 5:2 Kirkwood gaps in the main belt.[9] 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.[10]
Thalia has been studied by radar.[11]
References
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 23 Thalia". Jet Propulsion Laboratory. 2011-04-30. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=23. Retrieved 2012-01-28.
- ↑ 3.0 3.1 3.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: pp. 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
- ↑ "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.
- ↑ Stressed on the second syllable, /θəˈlaɪ.ə/.
- ↑ Lardner, Dionysius (1858). Hand-books of natural philosophy and astronomy. 3. Philadelphia: Blanchard and Lea. p. 315. https://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. https://archive.org/details/dictionaryminorp00schm.
- ↑ Lagerkvist, C.-I. (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. Archived from the original on 21 March 2007. https://web.archive.org/web/20070321171649/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.
External links
- 23 Thalia at AstDyS-2, Asteroids—Dynamic Site
- 23 Thalia at the JPL Small-Body Database
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