Xi1_Sagittarii
Xi1 Sagittarii
Star in the constellation Sagittarius
Xi1 Sagittarii (ξ1 Sagittarii) is a solitary,[11] blue-white hued star in the zodiac constellation of Sagittarius. It is visible to the naked eye with an apparent visual magnitude of +5.06.[2] Based upon a small annual parallax shift of 1.58 mas as seen from Earth,[1] this system is located roughly 2,100 light years from the Sun.
This is a massive supergiant star[6] with a stellar classification of B9/A0 Ib.[3] With an estimated 7.8[5] times the mass of the Sun and an age of about 40[5] million years it has depleted the hydrogen at its core, causing it to expand to about 15 times the Sun's radius.[6] It is radiating 2,753[7] times the Sun's luminosity from its photosphere at an effective temperature of about 9,400 K.[8]