138 Tolosa
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| Discovery | |
|---|---|
| Discovered by | Henri Joseph Perrotin |
| Discovery date | May 19, 1874 |
| Designations | |
| Named after | Toulouse |
| Alternative names | |
| Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 425.819 Gm (2.846 AU) |
| Perihelion | 306.744 Gm (2.050 AU) |
| Semi-major axis | 366.282 Gm (2.448 AU) |
| Eccentricity | 0.163 |
| Orbital period | 1399.371 d (3.83 a) |
| Average orbital speed | 18.91 km/s |
| Mean anomaly | 168.932° |
| Inclination | 3.208° |
| Longitude of ascending node | 54.948° |
| Argument of perihelion | 260.018° |
| Physical characteristics | |
| Dimensions |
51.86 ± 3.07[2] km 45.50 ± 2.1[3] km |
| Mass | (4.93 ± 2.59) × 1017[2] kg |
| Mean density | 6.74 ± 3.74[2] g/cm3 |
| Equatorial surface gravity | 0.0127 m/s² |
| Escape velocity | 0.0241 km/s |
| Rotation period | 10.103[3] h |
| Albedo | 0.2699 ± 0.027[3] |
| Temperature | ~178 K |
| Spectral type | S |
| Absolute magnitude (H) | 8.75 |
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138 Tolosa (to-loe'-za, Latin Tolōsa) is a brightly coloured, stony main-belt asteroid. It was discovered by French astronomer Henri Joseph Perrotin on May 19, 1874, and named after the Latin name for Toulouse, France.
The spectrum of this asteroid rules out the presence of ordinary chondrites, while leaning in favor of clinopyroxene phases. As of 2006, there are no known meteorites with compositions similar to the spectrum of 138 Tolosa.[3]
References
- ↑ Yeomans, Donald K., "138 Tolosa", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30.
- ↑ 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.
- ↑ 3.0 3.1 3.2 3.3 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): 94-106, Bibcode:2006Icar..181...94H, doi:10.1016/j.icarus.2005.10.003, retrieved 2013-03-30.
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