Arkab Posterior Beta2 Sagittarii
- X 14
- Y -56
- Z 121
- Infra-Red source
- UV-emission source
Beta2 Sagittarii (β2 Sagittarii) is a star in the zodiac constellation of Sagittarius. It is visible to the naked eye, having an apparent visual magnitude of +4.29. Based upon an annual parallax shift of 24.31 mas as seen from Earth, it is located 134 light years from the Sun.
Based upon variations in the proper motion of Beta2 Sagittarii, this is a probable astrometric binary system. Houk (1978) categorizes the visible component as an F-type main-sequence star with a stellar classification of F2/3 V. However, Malaroda (1975) lists it as an F-type giant star. It is spinning rapidly with a projected rotational velocity of 155 km/s. This is giving it an oblate shape with an equatorial bulge that is 22% larger than the polar radius. Beta2 Sagittarii has an estimated 1.4 times the mass of the Sun and is around 933 million years old.This article uses material from the Wikipedia article "Beta2 Sagittarii", which is released under the Creative Commons Attribution-Share-Alike License 3.0.