59 Sagittarii is a single

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

in the southern

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

of Sagittarius, about a degree to the south of Omega Sagittarii near the constellation border with Capricornus. It has the

Bayer designation A Bayer designation is a stellar designation in which a specific star is identified by a Greek or Latin letter followed by the genitive form of its parent constellation's Latin name. The original list of Bayer designations contained 1,564 stars. ...

b Sagittarii, or sometimes b¹ Sagittarii, while ''59 Sagittarii'' is the Flamsteed designation. The star is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.544. It forms the southeast corner of the Asterism (astronomy), asterism called the Terebellum (astronomy), Terebellum. Based upon stellar parallax, parallax measurements, the star is located approximately 830 light years away from the Sun. It is moving closer to the Earth with a heliocentric radial velocity of −16 km/s. This is an aging bright giant star with a stellar classification of K2.5IIb, having exhausted the supply of hydrogen at its stellar core, core and expanded to 100 times the radius of the Sun. It is 64 million years old with 6.2 times the Sun's mass. The star is radiating 2,825 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,204 K.

References

{{DEFAULTSORT:59 Sagittarii K-type bright giants Sagittarius (constellation) Bayer objects, Sagittarii, b Durchmusterung objects, CD-27 14399 Flamsteed objects, Sagittarii, 59 Henry Draper Catalogue objects, 188603 Hipparcos objects, 098162 Bright Star Catalogue objects, 7604