The
stellar classification of Alpha Indi is K0 III-IV, meaning that it has exhausted the hydrogen at its core and evolved away from the
main sequence, being now halfway between a
subgiant and a
giant star. It is estimated to be 1.6 billion years old, has 2.15 times the
mass of the Sun, but has expanded to 9.9 times the
radius of the Sun and irradiates 51 times
its luminosity. The
effective temperature of its
photosphere is 4,900 K, giving it the characteristic orange hue of a
K-type star. It may have two nearby M-type companion stars, which are located at least 2,000
AU from the primary. ==Nomenclature==