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HD 193664
HD 193664 is the Henry Draper Catalogue designation for a star in the northern constellation of Draco. With an apparent magnitude of 5.93,〔 according to the Bortle Scale it is visible to the naked eye from suburban skies. Parallax measurements by the Hipparcos spacecraft yield an estimated distance of 57.3 light years.〔 It has a relatively large proper motion of 0.558 arc seconds per year across the sky.〔
This star is considered a solar analog—meaning that it is photometrically analogous to the Sun—and it displays no significant variability.〔 It is a G-type main sequence star with a stellar classification of G3V.〔 Both the mass and radius of HD 193664 differ from those of the Sun by just a few percent, although it has a somewhat lower metallicity.〔 It may be around the same age as the Sun, being an estimated 3.9 billion years old.〔 The effective temperature of the stellar atmosphere is 5,915 K,〔 giving it the yellow-hued glow of a G-type star.〔
HD 193664 has been examined for signs of an infrared excess that could indicate the presence of a circumstellar disk of dust, but none has been found (as of 2012).〔 This is member of the thin disk population of stars that lie near the galactic plane.〔
== References ==
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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