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Nu Octantis
Nu Octantis is a spectroscopic binary star in the constellation Octans. Its apparent magnitude is 3.76. Located around distant,〔 the primary is an orange giant of spectral type K1III,〔 a star that has used up its core hydrogen and has expanded.
In 2009, the system was hypothesized to contain an exoplanet based on perturbations in the orbital period. A prograde solution was quickly ruled out but a retrograde solution remains a possibility, although the variations may instead be due to the secondary star being itself a close binary and the formation of a planet in the system is difficult due to dynamic perturbations.
==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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