Tianguan

Tianguan is a blue subgiant (spectral type B2IV) about 440 light-years away. With an apparent magnitude of 2.97 it is easy to see even from a city.

A star at the tip of the Bull's horn, near the Crab Nebula. The Chinese name means "heavenly gate".

Its light output is roughly 1,000 times that of the Sun (a rough estimate in visible light, calculated from brightness and distance).

From Germany (52° N) it rises and sets; it is best seen in the evening in December.