Stars between 11.5 and 12.5 l.y. Number of stars: 7  GROOMBRIDGE 34 11.6 LIGHT YEARS   MASS  A : 0.3  B : 0.15  C : ?   LUMINOSITY  0.0058 : A  0.00040 : B  ? : C      A triple star system. Groombridge 34 A is a red dwarf variable 'flare-type' star (spectral type M1) emitting irregular bursts of light, while its companions are an ordinary red dwarf (spectral type M6) lying 23.3 billion kilometres away and another star we know even less about (spectral type K?).    LACAILLE 9352 11.7 LIGHT YEARS   MASS  ?   LUMINOSITY  0.012      A small cool red dwarf of spectral type M2.    TAU CETI 11.9 LIGHT YEARS   MASS  0.82   LUMINOSITY  0.44      Tau Ceti (spectral type G8) is one of the nearest stars sufficiently like the Sun to be regarded as a possible centre for a planetary system and is considered to be a likely source for extraterrestrial life.    LUYTEN'S STAR 12.2 LIGHT YEARS   MASS  0.27   LUMINOSITY  0.0014      A single red dwarf of about one-quarter the Sun's mass with a surface temperature of about 3000 degrees Kelvin (spectral type M5). It is quite likely not alone as there may be a huge invisible companion of mass 60 with respect to Jupiter looming nearby. The time for this body to complete one orbit around Luyten's Star is about seven years.    LACAILLE 8760 12.5 LIGHT YEARS   MASS  0.4   LUMINOSITY  0.025      Another ordinary red dwarf (spectral type M0), typical of stars of this type.

 
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