Alpha Arae is somewhat more massive than the Earth's Sun, and is much brighter and hotter,
with a surface temperature of at least 10,000 Kelvin, and probably exceeding 20,000 K. It is highly variable: its
brightness in the sky can vary by almost a tenth of a magnitude, perhaps because of variations
in brightness on the surface of the star itself.
The brightest of the stars in Ara, the Altar, it lies in the central regions of the band of the Milky Way,
about 270 light years (about 80 parsecs) inward across the Galactic disc.