Barnard's star(redirected from Barnards Star)
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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.
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Barnard's starA red dwarf star in the constellation Ophiuchus that was discovered in 1916 by E.E. Barnard. The fourth-nearest star to the Sun, after the Alpha Centauri system, it has the largest known proper motion (10″.3 per year) and thus moves a distance equivalent to the Moon's diameter in 180 years. Observations of the star's position over many years show slight oscillating variations in right ascension and declination. It is thought that this wobbling motion is due to the presence of one or more planets orbiting the star. mv : 9.53; Mv : 13.21; spectral type: M4 V; distance: 1.83 pc.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
Barnard's star[′bär·nərdz ¦stär]
A star 6.1 light-years away from earth, of visual magnitude 9.5 and proper motion of 10.31 seconds of arc annually.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.