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HD 157661
HD 157661 is the Henry Draper Catalogue designation for a likely triple star〔 in the southern constellation of Ara. With a measured annual parallax of 5.13 mas,〔 is located at a distance of approximately from Earth. The combined apparent visual magnitude of the stars is 5.29,〔 which means it is faintly visible to the naked eye.
The inner components of this system consist of a pair of B-type main sequence stars. The brighter star has a magnitude of 5.70 and a stellar classification of B7 V. At an angular separation of 2.115 arcseconds is the magnitude 6.46 secondary component, which has a classification of B9.5 V. A third member of the system is a 7.6 magnitude A-type star at a separation of 103 arcseconds.〔
== 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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