Finding Proper Motion Pairs
Skip Navigation




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.

Need more information about proper motion? Check out these sites:


RBSEU is funded through a CCLI grant from the National Science Foundation



Indiana University

727 East 3rd Street, Swain West 319, Bloomington, IN 47405-7105
Phone: (812) 855-6911

Last updated: 30 November 2008
Comments: astdept [at] indiana [dot] edu
Copyright 2008, The Trustees of Indiana University
Copyright Complaints