Star profile

29 Cygni

Variable star

3D likeness based on its real data · class A · ~8,500 K

What is 29 Cygni

29 Cygni inhabits a rich stretch of the Swan, along the long axis that traces the bird in mid-flight across the night. It is a white A-type variable star about 139 light-years away —close enough for the ESA Hipparcos mission to have measured its luminous pulse with exquisite precision. Its light, dispatched in the first half of the 20th century, arrives today with the calm heartbeat of a young sun.

Where it is and when to see it

29 Cygni lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is August, when it culminates around midnight.

From London it culminates about 75° above the horizon.
From New York it culminates about 86° above the horizon.
From Sydney it culminates about 19° above the horizon.

It can be seen from anywhere north of 53° S.

It ranks no. 40 in brightness among the 137 stars of Cygnus in our catalogue. To find it, start from Deneb, the brightest: it lies about 10° away (a fist at arm's length covers about 10°).

The light you see today left it about 140 years ago.

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Astronomical data for 29 Cygni

Constellation: Cygnus
Apparent magnitude: 4.93
Distance: 139.3 light years
Coordinates (J2000): RA 303.633° · Dec 36.806°
Catalogue: HIP 99770 · HD 192640

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Other stars in Cygnus

Cygnus has 137 stars in Stelvia's catalogue. Here are a few of them.

See all 137 stars in Cygnus