ζ Sgr. Magnitude 2.60, white. Comfortably visible to the naked eye from a suburban sky.
Astronomers call it ζ Sgr — the Bayer designation, which reads as a Greek letter ranking its brightness within its constellation. Ascella is the name people actually use.
Ascella shines at magnitude 2.60, making it comfortably visible to the naked eye from a suburban sky. Its B−V colour index of 0.08 makes it white to the eye, corresponding to a surface temperature of around 8,000 K.
It sits at right ascension 19.04 hours and declination -29.9°. It lies south of the celestial equator and sits low for northern observers, better the further south you go.
SkyRef shows exactly where Ascella is from your location right now — altitude, compass direction, and rise and set times.