Alula Australis
Xi Ursae Majoris
Scientific overview
Alula Australis is a yellow dwarf in the constellation Ursa Major (Ursae Majoris), lying about 33.97 light-years from Earth.
Class G. Yellow stars like the Sun. On the main sequence they steadily fuse hydrogen into helium. Such stars have surface temperatures around 5,200–6,000 K and appear yellow to the eye.
Physical properties
| Spectral type | G0 Ve |
| Luminosity class | V |
| Apparent magnitude | 4.33 |
| Absolute magnitude | 4.24 |
| Luminosity (Sun = 1) | 1.752 |
| Colour index (B−V) | 0.59 |
| Distance | 33.97 ly (10.42 pc) |
Values are real catalogue data; fields without a reliable value are omitted, never estimated.
Evolution
A yellow dwarf is a G-type main-sequence star like the Sun. After about ten billion years it will swell into a red giant and finally leave behind a white dwarf.
Location in the sky
Knowledge connections
- In constellationUrsa Major
- System includesAlula Australis B
Related stars in Ursa Major
Sources
The primary and reference sources this topic draws on.
- HYG DatabaseHYG Database (Hipparcos + Yale Bright Star + Gliese), by D. Nash / astronexus
Aggregated, openly-licensed star catalogue combining Hipparcos, the Yale Bright Star Catalogue, and the Gliese Catalogue of Nearby Stars.
- HipparcosESA Hipparcos space astrometry mission
High-precision parallax, magnitude, and position for ~118,000 stars.