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HD 149382
HD 149382 is a star in the constellation of Ophiuchus with an apparent visual magnitude of 8.943.〔 This is too faint to be seen with the naked eye even under ideal conditions, although it can be viewed with a small telescope.〔 Based upon parallax measurements,〔 this star is located at a distance of about from the Earth.
This is the brightest known B-type subdwarf star with a stellar classification of B5 VI. It is generating energy through the thermonuclear fusion of helium at its core.〔 The effective temperature of the star's outer envelope is about 35,500 K, giving it the characteristic blue-white hue of a B-type star. HD 149382 has an optical companion located at an angular separation of 1 arcsecond.〔
In 2009, a substellar companion, perhaps even a superjovian planet, was announced orbiting the star.〔 This candidate object was estimated to have nearly half the mass of the Sun. In 2011, this discovery was thrown into doubt when an independent team of astronomers were unable to confirm the detection. Their observations rule out a companion with a mass greater than Jupiter orbiting with a period of less than 28 days.〔
== See also ==
* List of brown dwarfs
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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