30 Cygni

30 Cygni (ο1 Cygni) is a class A5III (white giant) star in the constellation Cygnus.

Its apparent magnitude is 4.83 and it is approximately 610 light years away based on parallax.

The Bayer letter ο (omicron) has been variously applied to two or three of the stars 30, 31, and 32 Cygni.

For clarity, it is preferred to use the Flamsteed designation 30 Cygni rather than one of the Bayer designations.

Both ο1 and ο2 are 4th magnitude stars.