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HD 164922
HD 164922 is a seventh magnitude star in the constellation of Hercules. It is an orange dwarf with a spectral type K0V. To view it, binoculars or a telescope are necessary, as it is too faint to be visible to the naked eye. It is 72 light years distant from the Earth.〔 At an age of 13.4 Gyr, it will soon evolve away from the main-sequence and expand to become a red giant. Its metallicity is nearly 50% more than the Sun. It is one of the oldest known stars in the Universe and one of the most ancient objects known in the Milky Way.
== Planetary system ==
On 15 July 2006, a long period Saturn-mass exoplanet was announced orbiting around HD 164922. This planet orbits at 2.11 AU from the star with a low eccentricity value of 0.05.〔
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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