ε Cas. Magnitude 3.38, blue-white. Visible to the naked eye from a reasonably dark site.
Astronomers call it ε Cas — the Bayer designation, which reads as a Greek letter ranking its brightness within its constellation. Segin is the name people actually use.
Segin shines at magnitude 3.38, making it visible to the naked eye from a reasonably dark site. Its B−V colour index of -0.15 makes it blue-white to the eye, corresponding to a surface temperature of over 10,000 K.
It sits at right ascension 1.91 hours and declination +63.7°. It is circumpolar from most of the northern hemisphere, meaning it never sets and can be found on any clear night.
SkyRef shows exactly where Segin is from your location right now — altitude, compass direction, and rise and set times.