138 Tolosa
Tolosa (minor planet designation: 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 ([tɔˈloːsa] and [tuˈluzɔ]) of the French city of Toulouse.
3D convex shape model of 138 Tolosa | |
| Discovery | |
|---|---|
| Discovered by | Henri Joseph Perrotin |
| Discovery date | 19 May 1874 |
| Designations | |
MPC designation | (138) Tolosa |
| Pronunciation | /toʊˈloʊsə/ |
Named after | Toulouse (Tolōsa) |
Alternative designations | A874 KA; 1909 SB |
Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 110.38 yr (40315 d) |
| Aphelion | 2.8463 AU (425.80 Gm) |
| Perihelion | 2.05145 AU (306.893 Gm) |
Semi-major axis | 2.44887 AU (366.346 Gm) |
| Eccentricity | 0.16229 |
Orbital period (sidereal) | 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 45.50±2.1 km |
| Mass | (4.93 ± 2.59) × 1017 kg |
Mean density | 6.74 ± 3.74 g/cm3 |
Equatorial surface gravity | 0.0127 m/s² |
Equatorial escape velocity | 0.0241 km/s |
Synodic rotation period | 10.101 h (0.4209 d) 10.103 h |
| 0.2699±0.027 | |
| Temperature | ~178 K |
| S | |
| 8.75 | |
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.
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