138 Tolosa

138 Tolosa
Discovery
Discovered by	Henri Joseph Perrotin
Discovery date	19 May 1874
Designations
MPC designation	(138) Tolosa
Pronunciation	/toʊˈloʊsə/[1][2]
Named after	Toulouse (Tolōsa)
Alternative designations
Minor planet category	Main belt
Orbital characteristics[3]
	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	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°
Argument of perihelion	260.825°
Physical characteristics
Dimensions	51.86 ± 3.07 km[4]; 45.50±2.1 km[3][5]
Mass	(4.93 ± 2.59) × 1017 kg[4]
Mean density	6.74 ± 3.74 g/cm3[4]
Equatorial surface gravity	0.0127 m/s²
Equatorial escape velocity	0.0241 km/s
Rotation period	10.101 h (0.4209 d)[3]; 10.103 h[5]
Geometric albedo	0.2699±0.027[3][5]
Temperature	~178 K
Spectral type	S
Absolute magnitude (H)	8.75

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.

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.[5]

References

Benjamin Smith (1903) The Century Dictionary and Cyclopedia
Noah Webster (1884) A Practical Dictionary of the English Language
Yeomans, Donald K., "138 Tolosa", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
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" (PDF), Icarus, 181 (1), pp. 94–106, Bibcode:2006Icar..181...94H, doi:10.1016/j.icarus.2005.10.003, retrieved 30 March 2013.

External links

138 Tolosa at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
138 Tolosa at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[1] Benjamin Smith (1903) The Century Dictionary and Cyclopedia

[2] Noah Webster (1884) A Practical Dictionary of the English Language

[JPL-3] Yeomans, Donald K., "138 Tolosa", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.

[Carry2012-4] Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.

[Hardersen2006-5] 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" (PDF), Icarus, 181 (1), pp. 94–106, Bibcode:2006Icar..181...94H, doi:10.1016/j.icarus.2005.10.003, retrieved 30 March 2013.