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HD 153950 b
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HD 153950 b is an extrasolar planet located approximately 162 light-years away〔 in the constellation of Scorpius, orbiting the 7th magnitude F-type main sequence star HD 153950. This planet has mass about 2.73 times that of Jupiter, but because the inclination is not known, the mass value is only minimum. So in next decade, the Gaia mission, Space Interferometry Mission, or James Webb Space Telescope will determine the inclination of all known extrasolar planets, including this planet. This planet takes about 499 days to orbit at an orbital distance about 1.28 AU and range from 0.84 to 1.72 AU, corresponding to the orbital eccentricity of 0.34.
This planet was discovered on October 26, 2008 by Moutou ''et al.'' using the HARPS spectrograph on ESO’s 3.6 meter telescope installed at La Silla Observatory in Atacama desert, Chile.〔
== Possible habitable moon ==
HD 153950 b is located within a habitable zone of its star. Based on a probable 10−4 fraction of the planet mass as a satellite,〔Canup R.M., Ward W.R. (2006). A common mass scaling for satellite systems of gaseous planets. Nature, 441: 834-839.〕 it can have a Mars-sized moon with habitable surface.〔(The Habitable Exoplanets Catalog: Data of Potential Habitable Worlds )〕 On the other hand, this mass can be distributed into many small satellites as well.
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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