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'''Epsilon Indi''' is a K4 orange dwarf star some 12 light years away.  It is the fifth brightest [[star]] of the constellation of [[Indus]].  The star is best known to astronomers as having the closest known [[Brown dwarf|Brown Dwarfs]] to our system.

'''Epsilon Indi''' is a K4 orange dwarf star some 12 light years away.  It is the fifth brightest [[star]] of the constellation of [[Indus]].  The star is best known to astronomers as having the closest known [[Brown dwarf|Brown Dwarfs]] to our system.

Epsilon Indi, along with [[Epsilon Eridani]] was first mentioned in the celestial atlas known as the ''Uranometria'' by [[Johann Bayer]] in 1603<ref name="eso">http://www.eso.org/public/outreach/press-rel/pr-2003/pr-01-03.html</ref>.

Epsilon Indi, along with [[Epsilon Eridani]] was first mentioned in the celestial atlas known as the ''Uranometria'' by [[Johann Bayer]] in 1603.<ref name="eso">http://www.eso.org/public/outreach/press-rel/pr-2003/pr-01-03.html</ref>

==The Star==

==The Star==

Epsilon Indi is a orange-red main sequence star of spectral class K4-5 Ve.   

Epsilon Indi is an orange-red main sequence star of spectral class K4-5 Ve.   

The star has some 77 percent of the mass of our Sun<ref>http://www.chara.gsu.edu/RECONS/</ref>, and some 76 percent of its diameter<ref>http://adsabs.harvard.edu/abs/1983ApJS...53..643J</ref>. Because it is a cooler class K star, Epsilon Indi is only 14.5 percent as luminous as our Sun.  The [[metallicity]] of Epsilon Indi is estimated from 59 to 110 percent that of our Sun, based on its abundance of [[iron]]<ref>http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1992A%26AS...95..273C</ref>.

The star has some 77 percent of the mass of our Sun,<ref>http://www.chara.gsu.edu/RECONS/</ref> and some 76 percent of its diameter.<ref>http://adsabs.harvard.edu/abs/1983ApJS...53..643J</ref>  Because it is a cooler class K star, Epsilon Indi is only 14.5 percent as luminous as our Sun.  The [[metallicity]] of Epsilon Indi is estimated from 59 to 110 percent that of our Sun, based on its abundance of [[iron]].<ref>http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1992A%26AS...95..273C</ref>

With an apparent magnitude of 4.69, Epsilon Indi can be seen by the unaided eye in dark skies with little light pollution.

With an apparent magnitude of 4.69, Epsilon Indi can be seen by the unaided eye in dark skies with little light pollution.

==Substellar Companions==

==Substellar Companions==

[[Image:Eps2iall.jpg|thumb|right|300px|Artist's conception of the Epsilon Indi system showing the star with its brown-dwarf binary companions. The relative sizes are not represented in this illustration.]]

[[Image:Eps2iall.jpg|thumb|right|300px|Artist's conception of the Epsilon Indi system showing the star with its brown-dwarf binary companions. The relative sizes are not represented in this illustration.]]

On January 13, 2003 it was announced by astronomers, that they had discovered a [[Brown dwarf|class T brown dwarf]] orbiting Epsilon Indi<ref name="eso">http://www.eso.org/public/outreach/press-rel/pr-2003/pr-01-03.html</ref>. Eight months later it was discovered that there was also a second brown dwarf that orbited the first<ref>http://www.gemini.edu/science/epsilonindi.html</ref>.

On January 13, 2003 it was announced by astronomers, that they had discovered a [[Brown dwarf|class T brown dwarf]] orbiting Epsilon Indi.<ref name="eso"/>  Eight months later it was discovered that there was also a second brown dwarf that orbited the first.<ref>http://www.gemini.edu/science/epsilonindi.html</ref>

===Epsilon Indi Ba===

===Epsilon Indi Ba===