| Minorplanet: | yes |
| Background: |
|
| 138 Tolosa | |
| Discovered: | 19 May 1874 |
| Mpc Name: | (138) Tolosa |
| Alt Names: | A874 KA; 1909 SB |
| Pronounced: | [1] [2] |
| Named After: | Toulouse (Tolōsa) |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 2.44887AU |
| Perihelion: | 2.05145AU |
| Aphelion: | 2.8463abbr=onNaNabbr=on |
| Eccentricity: | 0.16229 |
| Period: | 3.83 yr (1399.7 d) |
| Inclination: | 3.2038° |
| Asc Node: | 54.762° |
| Arg Peri: | 260.825° |
| Avg Speed: | 18.91 km/s |
| Dimensions: | 51.86 ± 3.07 km |
| Density: | 6.74 ± 3.74 g/cm3 |
| Surface Grav: | 0.0127 m/s² |
| Escape Velocity: | 0.0241 km/s |
| Rotation: | 10.101abbr=onNaNabbr=on 10.103 h |
| Abs Magnitude: | 8.75 |
| Mean Motion: | / day |
| Observation Arc: | 110.38 yr (40315 d) |
| Uncertainty: | 0 |
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 (pronounced as /la/ and in Occitan (post 1500); pronounced as /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.