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HD 10180
HD 10180 is a Sun-like star in the southern constellation Hydrus that is notable for its large planetary system. Since its discovery, at least seven planets, and possibly as many as nine, have been observed orbiting it,〔 making it the largest known exoplanetary system in terms of total confirmed planets (significantly larger than previous record holders, Kepler-11 and 55 Cancri) and potentially the largest of all known planetary systems, including the Solar System.〔
==Characteristics==
Based upon parallax measurements, it is located at a distance of about from Earth.〔 The apparent visual magnitude of this star is 7.33, which is too faint to be viewed with the naked eye although it can be readily observed with a small telescope.〔 At a declination of −60°, this star cannot be seen at latitudes north of the tropics.
HD 10180 is a G1V-type star, and thus generates energy at its core through the thermonuclear fusion of hydrogen. The mass of this star is estimated as 6% greater than the Sun's mass, it has a radius of 120% that of the Sun, and is radiating 149% of the Sun's luminosity. The effective temperature of the star's chromosphere is 5,911 K, giving it a yellow-hued glow like the Sun.〔 HD 10180 has a 20% higher abundance of elements other than hydrogen/helium compared to the Sun.〔 With an estimated age of 7.3 billion years, it is a stable star with no significant magnetic activity. The estimated period of rotation is about 24 days.〔
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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