.png) A three-dimensional model of 23 Thalia based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | J. R. Hind |
| Discovery date | 15 December 1852 |
| Designations | |
| MPC designation | (23) Thalia |
| Pronunciation | /θəˈlaɪ.ə/ |
| Named after | Thalia |
| Alternative designations | 1938 CL; 1974 QT2 |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 14 June 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 (sidereal) | 1555.679 d (4.26 a) |
| Mean anomaly | 328.687° |
| Inclination | 10.145° |
| Longitude of ascending node | 67.228° |
| Argument of perihelion | 59.311° |
| Physical characteristics | |
| Dimensions | 107.53 ± 2.2 km (IRAS) 106.81 ± 3.23 km |
| Mass | (1.96 ± 0.09) × 10 kg |
| Mean density | 3.07 ± 0.31 g/cm |
| Synodic rotation period | 12.312 h |
| Geometric albedo | 0.2536 (geometric) |
| Spectral type | S |
| Apparent magnitude | 9.11 to 13.19 |
| Absolute magnitude (H) | 7.17 |
23 Thalia (/θəˈlaɪ.ə/) is a large main-belt asteroid. It was discovered by J. R. Hind on 15 December 1852, at the private observatory of W. Bishop, located in Hyde Park, London, England. Bishop named it after Thalia, the Muse of comedy and pastoral poetry in Greek mythology.
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.
With a semimajor axis of 2.628, the asteroid is orbiting between the 3:1 and 5:2 Kirkwood gaps in the main belt. 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.
Thalia has been studied by radar.
Notes
References
- Webster, Noah (1884). A Practical Dictionary of the English Language.
- ^ "JPL Small-Body Database Browser: 23 Thalia". Jet Propulsion Laboratory. 30 April 2011. Retrieved 28 January 2012.
- ^ Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- "Albedos Data Table". Planetary Science Institute. Archived from the original on 22 July 2012. Retrieved 3 November 2008.
- Lardner, Dionysius (1858). Hand-books of natural philosophy and astronomy. Vol. 3. Philadelphia: Blanchard and Lea. p. 315. Retrieved 10 November 2009.
- 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. Retrieved 10 November 2009.
- Williams, Gareth (3 April 2007). "Distribution of the Minor Planets". Minor Planets Center. Archived from the original on 21 March 2007. Retrieved 15 April 2007.
- "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 30 October 2011.
External links
- 23 Thalia at AstDyS-2, Asteroids—Dynamic Site
- 23 Thalia at the JPL Small-Body Database
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