Zeta1_Muscae
Zeta1 Muscae
Star in the constellation Musca
Zeta1 Muscae, Latinized from ζ1 Muscae and abbreviated ζ1 Mus, is a suspected astrometric binary[5] star system in the constellation Musca, located 2.6° west of Beta Muscae.[6] It is bright enough to be visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.73,[2] forming a visual pair with nearby Zeta2 Muscae.[6] The ζ1 Mus system is around 417 light-years distant from the Sun, based on parallax, and is drifting further away with a radial velocity of +21 km/s.[2]
The suspected astrometric component of the ζ1 Mus system was identified from acceleration behavior in the proper motion of the main star.[7] The visible component is an aging giant star with a stellar classification of K0III;[4] a star that has used up its core hydrogen and is cooling and expanding. It now has 15[1] times the girth of the Sun and is radiating 98.5[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,737 K.[1]