Theta Sagittae


Theta Sagittae is a double star in the northern constellation of Sagitta. With a combined apparent visual magnitude of +6, it is near the limit of stars that can be seen with the naked eye. According to the Bortle scale the star is visible in dark suburban/rural skies. Based upon an annual parallax shift of as seen from Earth, it is located roughly from the Sun.
The binary pair consists of two stars separated by. The primary, component A, is an F-type main sequence star with a stellar classification of F3V. This star is about two billion years old with 52% more mass than the Sun. It forms a double star with a magnitude 8.85 companion, which is located at an angular separation of along a position angle of 331.1°, as of 2011. The star is sometimes described as a triple star, with a 7th magnitude companion away. This is an unrelated giant star much further away than the close pair. A fainter star separated by nearly was also listed as a companion by Struve, again just an accidental optical association.