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HD 192310
HR 7722 (also known as 5 G. Capricorni or Gliese 785) is a star in the constellation Capricornus. It is located in the solar neighborhood at a distance of just over 29 light years, and is within the range of luminosity needed to be viewed from the Earth with the unaided eye. HR 7722 is suspected of being a variable star, but this is unconfirmed.
HR 7722 has about 78% of the Sun's mass〔 and, depending on the estimation method, 79% to 85% of the radius of the Sun.〔 It is older than the Sun, with age estimates in the range 7.5–8.9 billion years.〔 The proportion of elements other than hydrogen and helium, known as the metallicity, is similar to that of the Sun.〔
The space velocity components of this star are (U, V, W) = . It is following an orbit through the Milky Way galaxy that has an orbital eccentricity of 0.18 at a mean galactocentric distance of 8.1 kpc.〔
==Planetary system==
The system has a Neptune-mass planet "b", discovered in 2010.〔 A second planet "c" was found in this system in 2011 by the HARPS GTO program, along with HD 85512 b and the planets of 82 G. Eridani. The uncertainty in the mass of the second planet is much higher than for the first because of the lack of coverage around the full orbit. Both planets may be similar in composition to Neptune. They are orbiting along the inner and outer edges of the habitable zone for this star.〔〔
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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