Changes

[[Image:Barnardstar2006.jpg|thumb|right|Location of Barnard's Star]]

| image          =Barnardstar2006.jpg

| rightascension  =17^h 57^m 48.5^s

| declination    =+04^o 41′ 36″

| distance        =5.98 ly

| type            =[[Star]]  

 

'''Barnard's Star''' is a very cool and dim star that is the third closest star to our [[solar system]] after [[Proxima Centauri]] and [[Alpha Centauri|Alpha Centauri AB]] respectively, located some 6 [[light year|light years]] from Sol in the constellation of [[Ophiuchus]]<ref>http://www.chara.gsu.edu/RECONS/TOP100.posted.htm</ref>.  

'''Barnard's Star''' is a very cool and dim star that is the third closest star to our [[solar system]] after [[Proxima Centauri]] and [[Alpha Centauri|Alpha Centauri AB]] respectively, located some 6 [[light year|light years]] from Sol in the constellation of [[Ophiuchus]]<ref>http://www.chara.gsu.edu/RECONS/TOP100.posted.htm</ref>.  

Barnard's Star is classified as a spectral type M4.0Ve red dwarf, with only 17 percent of Sol's mass, some 15 to 20 percent of its diameter, but only estimated to have .04% of the luminosity of our star.  If the Earth orbited Barnard's Star at the same distance as we orbit the sun, the star would be only 100 times more bright then the full moon<ref>http://www.solstation.com/stars/barnards.htm</ref>.   

Barnard's Star is classified as a spectral type M4.0Ve red dwarf, with only 17 percent of Sol's mass, some 15 to 20 percent of its diameter, but only estimated to have .04% of the luminosity of our star.  If the Earth orbited Barnard's Star at the same distance as we orbit the sun, the star would be only 100 times more bright then the full moon<ref>http://www.solstation.com/stars/barnards.htm</ref>.   

Scientists believe due to the star's low [[metallicity]] and high proper motion that Barnard's Star is an older [[Population II]] star that may be between 7 and 12 billion years old<ref>http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005AAS...206.0904R</ref>.  Barnard's Star was thought to be inactive, but in 1998 a flare was observed, which scientists believed would be unlikely on such an old star.

Scientists believe due to the star's low [[metallicity]] and high proper motion that Barnard's Star is an older [[metallicity|Population II]] star that may be between 7 and 12 billion years old<ref>http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005AAS...206.0904R</ref>.  The star is relativity inactive, and has a rotation period of only 130.4 days, typical for an older [[red dwarf]] star.  Barnard's Star however isn't completely inactive, but in 1998 a flare was observed, which scientists believed would be unlikely on such an old star.

In recent history there has been much speculation to whither or not Barnard's Star has any planetary companions.  During the late 1960s, astronomer Peter van de Kamp announced the detection of possibly two planets that revolved around each other, however his claim could never be verified, and recent observations have thus far failed to locate any evidence of planetary companions around the star.  In order for an Earth-type world to have liquid water at the surface, it would have to be located very close to Barnard's Star, at only around 0.034 to 0.082 AU.  Such a world would be tidally locked to the star.

In recent history there has been much speculation to whither or not Barnard's Star has any planetary companions.  During the late 1960s, astronomer Peter van de Kamp announced the detection of possibly two planets that revolved around each other, however his claim could never be verified, and recent observations have thus far failed to locate any evidence of planetary companions around the star.  In order for an Earth-type world to have liquid water at the surface, it would have to be located very close to Barnard's Star, at only around 0.034 to 0.082 AU.  Such a world would be tidally locked to the star.