Star profile

19 Cepheus

Hot blue star

3D likeness based on its real data · class O · ~30,000 K

What is 19 Cepheus

19 Cephei is a blue O-type supergiant, among the hottest and most massive stars on record: it weighs roughly twenty solar masses and burns at temperatures above thirty thousand degrees. It belongs to the Cep OB2 association, a nest of giant stars more than two thousand light-years away, and its spectrum shifts hour by hour under the lash of its own stellar wind. When this light departed, the Roman Empire had not yet fallen.

Where it is and when to see it

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

From London it never sets and culminates about 79° up.
From New York it never sets and culminates about 68° up.
From Sydney it never rises above the horizon.

It can be seen from anywhere north of 28° S.

It ranks no. 27 in brightness among the 95 stars of Cepheus in our catalogue. To find it, start from Alderamin, the brightest: it lies about 5° away (a fist at arm's length covers about 10°).

The light you see today left it about 2,100 years ago.

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Astronomical data for 19 Cepheus

Constellation: Cepheus
Apparent magnitude: 5.07
Distance: 2064.6 light years
Coordinates (J2000): RA 331.287° · Dec 62.280°
Catalogue: HIP 109017 · HD 209975

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Other stars in Cepheus

Cepheus has 95 stars in Stelvia's catalogue. Here are a few of them.

See all 95 stars in Cepheus