Star profile
11 Cepheus
What is 11 Cepheus
11 Cephei is a young orange giant —barely 670 million years old— already over twice the Sun's mass and swollen to twelve times its radius. With a 4.620-degree surface and sixty-one times the solar output, it lights a quiet corner of Cepheus from 182 light-years away. Its fate is plain: a planetary nebula waits on the cosmic horizon, and beyond it the crystalline silence of a white dwarf.
Where it is and when to see it
11 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 November, when it culminates around midnight.
- From London it never sets and culminates about 70° up.
- From New York it never sets and culminates about 59° up.
- From Sydney it never rises above the horizon.
It can be seen from anywhere north of 19° S.
It ranks no. 17 in brightness among the 95 stars of Cepheus in our catalogue. To find it, start from Alderamin, the brightest: it lies about 9° away (a fist at arm's length covers about 10°).
The light you see today left it about 180 years ago.
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Astronomical data for 11 Cepheus
- Constellation
- Cepheus
- Apparent magnitude
- 4.55
- Distance
- 182.4 light years
- Coordinates (J2000)
- RA 325.480° · Dec 71.311°
- Catalogue
- HIP 107119 · HD 206952
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Other stars in Cepheus
Cepheus has 95 stars in Stelvia's catalogue. Here are a few of them.
- AlderaminAlpha Cepheus2.45
- ErraiGamma Cepheus3.21
- AlfirkBeta Cepheus3.23
- Kappa Cepheus4.38
- Pi Cepheus4.41
- HIP 1024314.52
- HIP 1131164.70
- Omicron Cepheus4.75