Astronomy:138 Tolosa
_Tolosa.png) 3D convex shape model of 138 Tolosa | |
| Discovery | |
|---|---|
| Discovered by | Henri Joseph Perrotin |
| Discovery date | 19 May 1874 |
| Designations | |
| (138) Tolosa | |
| Pronunciation | /toʊˈloʊsə/[1][2] |
| Named after | Toulouse (Tolōsa) |
| A874 KA; 1909 SB | |
| Minor planet category | Main belt |
| Orbital characteristics[3] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 110.38 yr (40315 d) |
| |{{{apsis}}}|helion}} | 2.8463 astronomical unit|AU (425.80 Gm) |
| |{{{apsis}}}|helion}} | 2.05145 AU (306.893 Gm) |
| 2.44887 AU (366.346 Gm) | |
| Eccentricity | 0.16229 |
| Orbital period | 3.83 yr (1399.7 d) |
| Average Orbital speed | 18.91 km/s |
| Mean anomaly | 348.297° |
| Mean motion | 0° 15m 25.884s / day |
| Inclination | 3.2038° |
| Longitude of ascending node | 54.762° |
| 260.825° | |
| Physical characteristics | |
| Dimensions | 51.86 ± 3.07 km[4] 45.50±2.1 km[3][5] |
| Mass | (4.93 ± 2.59) × 1017 kg[4] |
| Mean density | 6.74 ± 3.74 g/cm3[4] |
Equatorial surface gravity | 0.0127 m/s² |
Equatorial escape velocity | 0.0241 km/s |
| Rotation period | 10.101 h (0.4209 d)[3] 10.103 h[5] |
| Geometric albedo | 0.2699±0.027[3][5] |
| Physics | ~178 K |
| S | |
| Absolute magnitude (H) | 8.75 |
138 Tolosa is a brightly coloured, stony background asteroid from the inner region of the asteroid belt. It was discovered by French astronomer Henri Joseph Perrotin on 19 May 1874, and named by the Latin and Occitan name (la and oc) of the French city of Toulouse.
This object is orbiting the Sun at a distance of 2.45 astronomical unit|AU with an eccentricity of 0.16 and an orbital period of 3.83 years. Its orbital plane is inclined at an angle of 3.2° relative to the plane of the ecliptic. Measurements of its diameter range from 46 to 52 km. It is spinning with a rotation period of 10.1 hours.
The spectrum of this asteroid rules out the presence of ordinary chondrites,[6] while leaning in favor of clinopyroxene phases. As of 2006, there are no known meteorites with compositions similar to the spectrum of 138 Tolosa.[5]
References
- ↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ 3.0 3.1 3.2 3.3 Yeomans, Donald K., "138 Tolosa", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=138, retrieved 12 May 2016.
- ↑ 4.0 4.1 4.2 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.
- ↑ 5.0 5.1 5.2 5.3 Hardersen, Paul S. et al. (March 2006), "Near-infrared spectral observations and interpretations for S-asteroids 138 Tolosa, 306 Unitas, 346 Hermentaria, and 480 Hansa", Icarus 181 (1): pp. 94–106, doi:10.1016/j.icarus.2005.10.003, Bibcode: 2006Icar..181...94H, http://media.aero.und.edu/observatory.space.edu/documents/Hardersen%20et%20al%202006.pdf, retrieved 30 March 2013.
- ↑ Hardersen, P. S.; Gaffey, M. J.; Abell, P. A. (March 2005), "Detailed Mineralogical Characterizations of Four S-Asteroids: 138 Tolosa, 306 Unitas, 346 Hermentaria, and 480 Hansa", 36th Annual Lunar and Planetary Science Conference, March 14-18, 2005, in League City, Texas, abstract no.1240, Bibcode: 2005LPI....36.1240H.
External links
- 138 Tolosa at AstDyS-2, Asteroids—Dynamic Site
- 138 Tolosa at the JPL Small-Body Database
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