Finding Proper Motion Pairs
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What Is Proper Motion?

The true motions of stars, known to astronomers as stars' proper motions, can be measured from images of the sky taken at different times, separated by many years. Nearby stars will move slightly between the images, each star moving in its own, random, direction and at its own speed. The proper motions of stars that are members of visual binary pairs will be nearly identical, moving at the same speed and in the same direction.

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