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physical object > natural object > celestial body > collection of stars > star system > binary star > Luyten 726-8
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Luyten 726-8 comparison table
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binary starstar system A system of two stars orbiting around a common center of gravity. Visual binaries are those whose components can be resolved telescopically (i.e., angular separation > 0'.5) and which have detectable orbital motion. Astrometric binaries are those whose dual nature can be deduced from their variable proper motion; spectroscopic binaries, those whose dual nature can be deduced from their variable radial velocity. At least half of the stars in the solar neighborhood are members of binary (or multiple) systems. (See photometric binaries; optical pairs.) 
Luyten 726-8 binary starA binary (M5.5e V, M6e V) (component B is UV Cet) with a very small mass (total mass of system (1974) 0.3 Msun ).2.7 pc

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