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HD 188753
HD 188753 is a hierarchical triple star system approximately 151 light-years away in the constellation of Cygnus, the Swan. In 2005, an extrasolar planet was announced to be orbiting the primary star (designated HD 188753 A) in the system. Follow-up measurements by an independent group in 2007 did not confirm the planet's existence.〔
== Stellar components ==
The primary star, HD 188753 A, is similar to the Sun〔 with a mass only 6% larger and a stellar classification of G8V.〔 Orbiting this primary at a distance of 12.3 AU〔 is a pair of smaller stars that orbit each other with a period of , a semi-major axis of 0.67 AU, and eccentricity of . The pair have estimated masses of 0.96 and 0.67 solar masses.〔 They orbit the primary with a period of about 25.7 years and an orbital eccentricity of about 0.50.〔 The periastron distance of this orbit is 6.2 AU.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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