Barnard's star

Barnard's star, star with the largest observed proper motion (rate of motion across the sky with respect to other stars) located in the constellation Ophiuchus. The star's large proper motion, 10.28″ per year (or half the moon's apparent diameter in a century), is due in part to the fact that it is the second-nearest star, being at a distance of 5.98 light-years. Barnard's star was discovered in 1916 by E. E. Barnard, an observer known also for his discoveries of 16 comets. It is a faint red dwarf star, apparent magnitude 9.5, of spectral class M5, lying near the bottom of the main sequence in the Hertzsprung-Russell diagram . Slight oscillations in its motion indicate that it has at least one unseen companion.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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