Star
Alderamin
White star · A7IV-V
α Cephei · Cepheus
Shown in its true colour — like most stars, it is too far away to photograph as more than a point of light.
Alpha Cephei is a second magnitude star in the northern constellation of Cepheus. It has the official name Alderamin, pronounced ; Alpha Cephei is its Bayer designation, which is Latinized from α Cephei and abbreviated Alpha Cep or α Cep. The star is relatively close to Earth at 49 light years (ly) and drifting closer with a heliocentric radial velocity of about −16 km/s.
Description from Wikipedia (CC BY-SA 4.0).
In your sky
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Key facts
Distance
~49 light-years
Apparent mag.
+2.45
Spectral type
A7IV-V
Luminosity
20.6 × Sun
Absolute mag.
+1.56
Catalogue
HIP 105199
Spectral type
A7IV-V
True colour from its B–V index (0.26): a surface around 7700 K.
Did you know
- Alderamin is also known as α Cephei.
- Its spectral type A7IV-V marks it as a white star.
- It lies in the constellation Cepheus.
