         mu arae (Î¼ ara, Î¼ arae), often referred to by its designation in the henry draper catalogue hd 160691, is a main sequence g-type star around 50 light-years away from earth in the constellation of ara. the star has a planetary system with four known planets, three of them with masses comparable to that of jupiter. the system's innermost planet was the first "hot neptune or super-earth" to be discovered. == distance and visibility == according to measurements made by the hipparcos astrometric satellite, mu arae exhibits a parallax of 64.47 milliarcseconds as the earth moves around the sun. when combined with the known distance from the earth to the sun, this means the star is located at a distance of 50.6 light years (15.51 parsecs).the formula for converting parallax to distance is \scriptstyle\mathrm{distance\ in\ parsecs}=\frac{1}{\mathrm{parallax\ in\ arcseconds}} seen from earth it has an apparent magnitude of +5.12 and is visible to the naked eye. == stellar characteristics == asteroseismic analysis of the star reveals it is approximately 10% more massive than the sun and significantly older, at around 6,340 m
Ara_(constellation) Bayer_objects Durchmusterung_objects G-type_main-sequence_stars G-type_subgiants Gliese_and_GJ_objects HR_objects Henry_Draper_Catalogue_objects Hipparcos_objects Objects_within_100_ly_of_Earth Planetary_systems_with_four_confirmed_planets