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Alula Australis B
Xi
Binary systemIts story
Alula Australis B is part of a binary system observed by William Herschel in 1780 and was the first true binary whose orbit around its common centre of mass could actually be calculated by astronomers. This component, a yellow G-type star, lies just 34 light-years from here — a near neighbour, dancing silently with its twin every sixty years beneath the foot of the Great Bear.
- Constellation
- Ursa Major
- Apparent magnitude
- 4.80
- Distance
- 34.0 light years
- Coordinates (J2000)
- RA 169.547° · Dec 31.529°
- Catalogue
- HYG 118743 · HD 98230
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