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HD 143361
HD 143361 is a binary star in the southern constellation Norma. With an apparent visual magnitude of 9.20,〔 this star is too dim to be seen with the naked eye. It is close enough to the Earth that its distance can be determined using parallax measurements, yielding a value of roughly .〔
This is a G-type main sequence star with a stellar classification of G6 V.〔 It has around 95% of the Sun's mass and is around 8.1〔 billion years old. In 2007, it was discovered that it has a companion—an M-type star with a classification in the range M3.5–M6.5 and around 14% of the mass of the Sun. The two are separated by about 30.9 AU and have an orbital eccentricity of 0.69.〔
==Planetary system==
In October 2008 the planet HD 143361 b was reported to be orbiting this star. This object was detected using the radial velocity method during an astronomical survey conducted by the Magellan Planet Search Program using the MIKE echelle spectrograph on the 6.5-m Magellan II (Clay) telescope.〔
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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