NOTABLE STARS EXTRASOLAR PLANETS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site Epsilon Indi Epsilon Indi and its brown dwarfs One of the nearest stars to the Sun. Epsilon Indi is a dwarf K star, orange in color, somewhat cooler than the Sun, and with about one-seventh the solar luminosity; it lies in the constellation Indus. Epsilon Indi has the tenth largest proper motion of any known star. Because, relatively speaking, it is moving so quickly across the sky, in only a few thousand years it will have moved out of Indus and into the neighboring constellation Tucana (the Toucan). The brown dwarfs of Epsilon Indi Around Epsilon Indi, at an average distance of 1.46 AU (220 million km), orbits the nearest known brown dwarf. Discovered in 2003, this brown dwarf, Epsilon Indi Ba, has a mass of 40 to 60 times the mass of Jupiter and a surface temperature of about 1,260 K. Shortly after its discovery, Epsilon India Ba was found to have an orbital companion of its own – a cooler, fainter brown dwarf known as Epsilon Indi Bb. The projected separation as seen on the sky between Epsilon Indi and Indi Ba is approximately 1500 AU (one AU, or astronomical unit, is the average distance between the Earth and the Sun or about 93 million miles/150 million km), and the distance between Epsilon Indi Ba and the newly discovered Epsilon Indi Bb is at least 2.2 AU. Epsilon Indi Ba and Bb are members of a recently discovered type of astronomical object – the "T" class brown dwarfs. Epsilon Indi data visual magnitude 4.69 absolute magnitude 7.00 spectral type K5Ve luminosity 0.14 Lsun mass 0.77 Msun radius 0.76 Rsun distance 11.8 light-years Related entry    • nearest stars Related category    • NOTABLE STARS    • EXTRASOLAR PLANETS AND SUBSTELLAR OBJECTS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP