The third type of binary, consisting of two Sun-like stars, has only one example within the Solar neighborhood. This is 83 Leonis, located at a distance of 18 parsecs (59 light years) in the constellation Leo. The primary is a G8 star of 1.01 MSOL (Desidera & Barbieri 2006) without any detected planets. The binary companion is a K2 star of 0.86 MSOL hosting a giant planet of sub-Saturn mass, traveling in an eccentric orbit with a semimajor axis of 0.12 AU. The separation between the binary stars is substantial, at about 515 AU (Desidera & Barbieri 2006).

A somewhat similar system is 16 Cygni, located at a distance of 21.4 parsecs (70 light years) in the constellation Cygnus. This is a possible triple system consisting of two G stars of almost identical mass (~ 1.0 MSOL) separated by about 877 AU (Hauser & Marcy 1999), as well as a poorly understood low-mass companion star, perhaps a red dwarf. The single detected planet, at 1.68 MJUP, orbits 16 Cygni B in an extremely eccentric orbit (e = 0.68) with a semimajor axis of 1.68 AU.

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Last update March 2007