Mu1 Gruis

It is visible to the naked eye with a combined apparent visual magnitude of 4.79.

[2] The distance to this system, as determined using an annual parallax shift of 11.44 mas as seen from the Earth,[8] is around 275 light years.

[6] The yellow-hued primary component is an evolved giant star with stellar classification of G III[4] and visual magnitude 5.20.

[3] With the supply of hydrogen at its core exhausted, it cooled and expanded; at present it has nine[1] times the girth of the Sun.

The star is radiating 67 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,422 K.[1] The secondary component is magnitude 6.68 and classed as a G-type star,[3] although its color index and absolute magnitude suggest it is of type A6.