| Exoplanetary Scratchpad |
Alula Australis is also known as Xi Ursae Majoris, HR 4375, and Gl 423. Nearby possible quadruple star system. Star A straddles the line between a white-yellow and a yellow dwarf star, is slightly more massive, and slightly smaller than the Sun. It is thought to be about 2 Billion years old and classified as a RS Canum Venaticorum variable type star. Star A is a spectroscopic binary, with star Ab orbiting from 0.8 to 2.6 AU, making any habitable planetary orbit unstable. Star B is another yellow dwarf star, about 90% as massive and as large as the Sun. It may be orbited by a brown dwarf or low mass red dwarf (Bb) in a torch orbit. The pair is separated from Stars A by 12.5 to 39.9 AU. A fifth orange dwarf Bc component has been suspected, but appears not to move with the system. A second brown dwarf in the system was found in 2012.
Alula Australis System Web Pages
Alula Australis System In the News
Sample (Year)
See Also
- Aliases: Xi Ursae Majoris System, Alula Australis System, HR 4375 System, Gliese 423 System
- Nearest White Main Sequence Star: Denebola