23 Thalia (/θəˈlaɪ.ə/[a]) 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.[5] Bishop named it after Thalia, the Muse of comedy and pastoral poetry in Greek mythology.[6]
| Discovery | |
|---|---|
| Discovered by | J. R. Hind |
| Discovery date | 15 December 1852 |
| Designations | |
| (23) Thalia | |
| Pronunciation | /θəˈlaɪ.ə/[1][a] |
Named after | Thalia |
| 1938 CL; 1974 QT2 | |
| 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) |
| 393.073 Gm (2.628 AU) | |
| Eccentricity | 0.233 |
| 1555.679 d (4.26 a) | |
| 328.687° | |
| Inclination | 10.145° |
| 67.228° | |
| 59.311° | |
| Physical characteristics | |
| Dimensions | 107.53 ± 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] |
| 12.312 h[2] | |
| 0.2536 (geometric)[4] | |
| S [2] | |
| 9.11 to 13.19 | |
| 7.17[2] | |
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.[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]
- ^ Webster, Noah (1884). A Practical Dictionary of the English Language.
- ^ a b c d “JPL Small-Body Database Browser: 23 Thalia”. Jet Propulsion Laboratory. 30 April 2011. Retrieved 28 January 2012.
- ^ a b c 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.
- 23 Thalia at AstDyS-2, Asteroids—Dynamic Site
- 23 Thalia at the JPL Small-Body Database
