Epsilon Indi (ε Ind, ε Indi) is a star system approximately 12 light-years away from the Earth in the constellation of Indus consisting of a K-type main-sequence star, ε Indi A, and two brown dwarfs, ε Indi Ba and ε Indi Bb, in a wide orbit around it. Both brown dwarfs are of spectral class T; the more massive component, ε Indi Ba, is of spectral type T1V–T1.5V and the less massive component, Epsilon Indi Bb, of spectral type T6V.
Epsilon Indi is a main-sequence star of spectral type K4.5V. The star has only about three-fourths the mass of the Sun. Its surface gravity is slightly higher than the Sun's. The metallicity of a star is the proportion of elements with higher atomic numbers than helium, being typically represented by the ratio of iron to hydrogen compared to the same ratio for the Sun; Epsilon Indi is found to have about 87% of the Sun's proportion of iron in its photosphere.
This star has the third highest proper motion of any star visible to the unaided eye, after Groombridge 1830? and 61 Cygni, and the ninth highest overall. This motion will move the star into the constellation Tucana around 2640 AD. Epsilon Indi has a space velocity relative to the Sun of 86 km/s, which is unusually high for what is considered a young star. It is thought to be a member of the ε Indi moving group of at least sixteen population I stars. This is an association of stars that have similar space velocity vectors, and therefore most likely formed at the same time and location.
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In Space Opera
- Protector (1973), Known Space novel written by Larry Niven. Home is one of Earth's most distant colonies, the second planet of the star Epsilon Indi.
- And the Children Shall Lead? (1966), episode of Star Trek: The Original Series? written by Edward J. Lakso?, as part of the film, television, and print franchise originated by Gene Roddenberry?. Epsilon Indi is the home system of an evil energy being known as Gorgan?.
- Star Fleet Technical Manual? (1975), fiction reference book by Franz Joseph Schnaubelt?. Epsilon Indi's "Star Empire?" is one of the five founding signatories of the United Federation of Planets?' original Articles of Federation.
- The Child? (1988), episode of Star Trek: The Next Generation? written by Jon Povill? et al. Wesley Crusher describes Epsilon Indi while wistfully looking out the window of the show's recreational area, Ten-Forward.
- Space: Above and Beyond (1995–1996), television series created by Glen Morgan and James Wong. In early 2063, The Chigs declare war on humanity, launching what appears to be an unprovoked first-strike against the budding interstellar colonies of Vesta? and Tellus?. The Epsilon Indi system is the site of the Tellus colony.
- Halo: Contact Harvest? (2007), novel set in the Halo universe? and written by Joseph Staten?. Humanity has spread across the galaxy, and the outer colony planet Harvest? in the Epsilon Indi system is one of the most remote. Although Harvest itself is only one-third the size of Earth, its fertile surface serves as the breadbasket for other colonies. Harvest is the first human world attacked by the theocratic alliance of aliens known as the Covenant—which sets the basic conflict of the entire Halo series in motion.