Collinder 69

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Collinder 69
Observation data (J2000 epoch)
Constellation Orion
Right ascension 05h 35m 06s[1]
Declination +09° 56.0′[1]
Distance 1,300 ly (400 pc)[1]
Physical characteristics
Estimated age 5.0[1] Myr
See also: Open cluster, List of open clusters

Collinder 69 (Lambda Orionis Association) is an open star cluster located north-west of the star Betelgeuse in the constellation of Orion. It is about five million years old and roughly 1,300 ly (400 pc) away from the Sun.[1] Included within the cluster is a double star named Meissa. With the rest of Orion, it is visible from the middle of August in the morning sky, to late April before Orion becomes too close to the Sun to be seen well. It can be seen from both the northern hemisphere and the southern hemisphere.

The cluster is following an orbit through the Milky Way that has a period of 227.4 million years with an ellipticity of 0.06, carrying it as far as 28 kly (8.6 kpc) from the Galactic Center, and as close as 25 kly (7.7 kpc). The inclination of the orbit carries it up to 260 light-years (80 parsecs) away from the galactic plane. On average it crosses the plane every 33.3 million years.[1]

See also[edit]

Other celestial bodies included in the constellation Orion:


  1. ^ a b c d e f Wu, Zhen-Yu; et al. (November 2009), "The orbits of open clusters in the Galaxy", Monthly Notices of the Royal Astronomical Society, 399 (4): 2146–2164, arXiv:0909.3737free to read, Bibcode:2009MNRAS.399.2146W, doi:10.1111/j.1365-2966.2009.15416.x. 
  • Sky Atlas 2000.0 Second Edition