729 Watsonia

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729 Watsonia
Discovered by Joel Hastings Metcalf
Discovery site Winchester, Massachusetts
Discovery date February 9, 1912
Alternative names 1912 OD
Orbital characteristics[1]
Epoch August 18, 2005 (JDCT 2453600.5)
Aphelion 3.023 AU
Perihelion 2.496 AU
Semi-major axis 2.760 AU
Eccentricity 0.095
Orbital period 4.584 a
Mean anomaly 86.129°
Inclination 18.062°
Longitude of ascending node 124.670°
Argument of perihelion 85.559°

729 Watsonia is a minor planet orbiting the Sun. It was named after the Canadian-American astronomer James C. Watson. Asteroid (729) Watsonia occulted the star HIP 53417 (54 Leonis A/B, 4.3 Magnitude Star) on 2013 Mar 03 at 01:48.

This object is the namesake of a family of 31–139 asteroids that share similar spectral properties and orbital elements; hence they may have arisen from the same collisional event. All members have a relatively high orbital inclination.[2]


  1. ^ Yeomans, Donald K., "729 Watsonia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30. 
  2. ^ Novaković, Bojan et al. (November 2011), "Families among high-inclination asteroids", Icarus 216 (1): 69-81, arXiv:1108.3740, Bibcode:2011Icar..216...69N, doi:10.1016/j.icarus.2011.08.016. 

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