138 Tolosa

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138 Tolosa
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

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[edit]

  1. ^ Yeomans, Donald K., "138 Tolosa", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30. 
  2. ^ a b c 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. ^ a b c d 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.