Alpha Microscopii
Alpha Microscopii is a star in the southern constellation of Microscopium. It is visible to the naked eye with an apparent visual magnitude that varies between 4.88 and 4.94. Based upon an annual parallax shift of 8.2214 mas as seen from the Earth, it is located 400 ± 30 light years from the Sun. The star is moving nearer to the Sun with a radial velocity of −15 km/s.
This is an evolved giant star of type G with a stellar classification of G7 III. At the age of 360 million years, it has an estimated 3.1 times the mass of the Sun and has expanded to around 16 times the Sun's radius. The star is radiating 160 times the Sun's luminosity from its expanded photosphere at an effective temperature of 4,923 K.
This star has an optical visual companion, CCDM J20500-3347B, of apparent visual magnitude 10.0 approximately 20.4 arcseconds away at a position angle of 166°. It has no physical connection to the star described above.
