23 Thalia
| Discovery | |
|---|---|
| Discovered by | J. R. Hind |
| Discovery date | December 15, 1852 |
| Designations | |
| Pronunciation | /θəˈlaɪ.ə/ thə-LY-ə |
| Named after | Thalia |
| Alternative names | 1938 CL; 1974 QT2 |
| Minor planet category | 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) |
| 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° |
| 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 |
| Equatorial surface gravity | 0.0300? m/s² |
| Escape velocity | 0.0568? km/s |
| Rotation period | 12.312 h[1] |
| Albedo | 0.2536 (geometric)[3] |
| Temperature | ~164 K |
| Spectral type | S[1] |
| Apparent magnitude | 9.11 to 13.19 |
| Absolute magnitude (H) | 6.95[1] |
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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
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 23 Thalia". Jet Propulsion Laboratory. 2011-04-30 last obs. Retrieved 2012-01-28.
- ↑ 2.0 2.1 2.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 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. Retrieved 2008-11-03.
- ↑ Stressed on the second syllable, /θəˈlaɪ.ə/ thə-LY-ə.
- ↑ Hand-books of natural philosophy and astronomy 3. Philadelphia: Blanchard and Lea. 1858. p. 315. 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. 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.
- ↑ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2011-10-30.
External links
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