Common proper-motion pairs are an interesting group to research because they do not fall into either of the extensively studied groups of orbiting binaries or open clusters and because each component of a common proper-motion pair can be considered to be at the same distance from the observer, of the same age and subject to the same degree of reddening.
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This page was last updated on August 29th 2012.
Martin Nicholson - Ticklerton, Shropshire, United Kingdom