Altair

Altair is a blue-white main-sequence star (spectral type A7V) about 16.7 light-years away. With an apparent magnitude of 0.76 it is a very bright, conspicuous star.

It rotates once in only 9 hours, which flattens it noticeably.

Its light output is roughly 10 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 July.