λ Sgr. Magnitude 2.81, orange-red. Comfortably visible to the naked eye from a suburban sky.
Astronomers call it λ Sgr — the Bayer designation, which reads as a Greek letter ranking its brightness within its constellation. Kaus Borealis is the name people actually use.
Kaus Borealis shines at magnitude 2.81, making it comfortably visible to the naked eye from a suburban sky. Its B−V colour index of 1.04 makes it orange-red to the eye, corresponding to a surface temperature of under 4,000 K.
It sits at right ascension 18.47 hours and declination -25.4°. It lies south of the celestial equator and sits low for northern observers, better the further south you go.
SkyRef shows exactly where Kaus Borealis is from your location right now — altitude, compass direction, and rise and set times.