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HD 1237
HD 1237 is a binary star system approximately 57 light-years away in the constellation of Hydrus (the Water Snake).
The visible star in the system, A, is considered to be a Solar twin. As of 2000, it has been confirmed that an extrasolar planet orbits the star. It is of note for being a relatively Sun-like star not very far from the Sun that is home to an extrasolar planet.〔
== Stellar components ==
As a nearby Sun-like star, the last decade has seen HD 1237 A being studied carefully for the first time, especially after its substellar companion was discovered. It is currently believed that it is 800 million years old, though age estimates range from 150 million to 8.8 billion years old depending on the method used for the determination.〔 The star is more enriched with iron than the Sun, is chromospherically active, and rotates around its axis more quickly than the Sun.
The secondary star HD 1237 B is a M4 red dwarf star at a projected physical separation of 68 AU.〔
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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