Star profile

25 Cygni

Variable star

3D likeness based on its real data · class B · ~15,000 K

What is 25 Cygni

25 Cygni lives 1,321 light-years deep into the Swan, a B-class blue subgiant several times hotter than the Sun and thousands of times more luminous. Its brightness is not perfectly steady —hence its variable tag, V1746 Cyg— with subtle oscillations that hint at inner processes still under study. The light reaching us tonight set out around the year 700 AD.

Where it is and when to see it

25 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 76° 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. 57 in brightness among the 137 stars of Cygnus in our catalogue. To find it, start from Deneb, the brightest: it lies about 11° away (a fist at arm's length covers about 10°).

The light you see today left it about 1,300 years ago.

Find it on the sky map

It opens in your browser. Free, no account, nothing to install.

Leave your signature on 25 Cygni

Your name and a message go up on the map for everyone to read. Signing is free.

Without a lock, someone else can replace your signature. How the lock works

We'll ask for an email to confirm it's you, no password.

Write my signature

A public signature from a real person. The chosen name is a symbolic denomination within Stelvia, with no official standing or IAU recognition: the sky is not for sale and belongs to no one.

Astronomical data for 25 Cygni

Constellation: Cygnus
Apparent magnitude: 5.15
Distance: 1320.6 light years
Coordinates (J2000): RA 299.980° · Dec 37.043°
Catalogue: HIP 98425 · HD 189687

A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.

Other stars in Cygnus

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

See all 137 stars in Cygnus