|Alpha Arae has roughly the same mass as the Earth's Sun, but is much brighter and hotter,
with a surface temperature of at least 10,000 Kelvin. 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 240 light years (about 75 parsecs) inward across the Galactic disc.