119 Althaea

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119 Althaea
119Althaea (Lightcurve Inversion).png
A three-dimensional model of 119 Althaea based on its light curve.
Discovered by James Craig Watson
Discovery date April 3, 1872
Named after Althaea
Minor planet category Main belt
Orbital characteristics[1]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 417.511 Gm (2.791 AU)
Perihelion 354.870 Gm (2.372 AU)
Semi-major axis 386.190 Gm (2.582 AU)
Eccentricity 0.081
Orbital period 1515.000 d (4.15 a)
Average orbital speed 18.51 km/s
Mean anomaly 1.847°
Inclination 5.778°
Longitude of ascending node 203.738°
Argument of perihelion 171.282°
Physical characteristics
Dimensions 57.3 km
Mass 2.0×1017 kg
Equatorial surface gravity 0.0160 m/s²
Escape velocity 0.0303 km/s
Rotation period 11.484[2] h
Temperature ~173 K
Spectral type S
Absolute magnitude (H) 8.42

119 Althaea is a main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on April 3, 1872,[2] and named after Althaea, the mother of Meleager in Greek mythology. Two occultations by Althaea were observed in 2002, only a month apart.

Based upon its spectrum, this is classified as an S-type asteroid.[3] Photometric observations made in 1988 at the Félix Aguilar Observatory produced a light curve with a period of 11.484 ± 0.010 hours with a brightness variation of 0.365 ± 0.010 in magnitude.[2]


  1. ^ Yeomans, Donald K., "119 Althaea", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25. 
  2. ^ a b c Hutton, R. G. (June 1990), "V+B Photoelectric Photometry of Asteroid 119 Althaea", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 17: 15-17, Bibcode:1990MPBu...17...15H. 
  3. ^ DeMeo, Francesca E. et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared", Icarus 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, retrieved 2013-04-08.  See appendix A.