138 Tolosa
3D convex shape model of 138 Tolosa | |
| Discovery | |
|---|---|
| Discovered by | Henri Joseph Perrotin |
| Discovery date | 19 May 1874 |
| Designations | |
| (138) Tolosa | |
| Pronunciation | /toʊˈloʊsə/ |
Named after | Toulouse (Tolōsa) |
| A874 KA; 1909 SB | |
| 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) |
| 2.44887 AU (366.346 Gm) | |
| Eccentricity | 0.16229 |
| 3.83 yr (1399.7 d) | |
Average orbital speed | 18.91 km/s |
| 348.297° | |
| 0° 15m 25.884s / day | |
| Inclination | 3.2038° |
| 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 |
| 10.101 h (0.4209 d) 10.103 h | |
| 0.2699±0.027 | |
| Temperature | ~178 K |
| S | |
| 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 ([tɔˈloːsa] and [tuˈluzɔ]) of the French city of Toulouse.
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.