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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. |
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"Barnard's star." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "Barnard's star." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1E1-Barnards.html "Barnard's star." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-Barnards.html |
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Barnard's Star
Barnard's Star The second-closest star to the Sun, 5.9 l.y. away in Ophiuchus. It is an M4 dwarf of apparent magnitude 9.5, with a luminosity 2000 times less than the Sun's. It has the largest proper motion of any star known, 10”.36 per year, as was discovered in 1916 by E. E.Barnard, after whom the star is named.
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"Barnard's Star." A Dictionary of Astronomy. 1997. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "Barnard's Star." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O80-BarnardsStar.html "Barnard's Star." A Dictionary of Astronomy. 1997. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-BarnardsStar.html |
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Barnard's star
Barnard's star Red dwarf star six light years away in the constellation Ophiuchus. It is the closest star to the Sun after the Alpha Centauri system, and was discovered in 1916 by the US astronomer Edward Barnard (1857–1923).
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"Barnard's star." World Encyclopedia. 2005. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "Barnard's star." World Encyclopedia. 2005. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O142-Barnardsstar.html "Barnard's star." World Encyclopedia. 2005. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-Barnardsstar.html |
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