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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:03 
Transit: 12:56 
Sunset: 20:50
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All Constellations » Cepheus » 

Alderamin - α Cephei (alpha Cephei)

Above the horizon.  Circumpolar today
Alt: 45.30°   Az: 40.63°   Direction: North-East

Alderamin, also designated as α Cephei (alpha Cephei), is a variable and multiple main-sequence star of spectral class A7 in the constellation of Cepheus.

Alderamin visual magnitude is 2.44, making it the 85th brightest star in the sky. Because of its brightness, Alderamin is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Image of Alderamin - α Cephei (alpha Cephei) star
DSS2 image of Alderamin. The red arrow shows the motion of Alderamin during the next 1000 years (2.52 arcmin in Right Ascension and 0.82 arcmin in declination);

Celestial Coordinates

Apparent

21h 19m 10s
+62° 41’ 36”
18h 12m 30s
15h 31m 40s

J2000

21h 18m 34s
+62° 35’ 08”

Galactic Coordinates

101°
9.17°

Finder Chart

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Finder chart for Alderamin - α Cephei (alpha Cephei).

Magnitude, Color, Spectral Class

2.44
Main-sequence

1.57
A7V
8011K

The red dot in the diagram below shows where Alderamin is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of Alderamin. Attribution: Richard Powell / CC BY-SA

Star System Properties

Alderamin is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Alderamin double sysyem:

2.44
11.54
9.1
206.8 arcsec

Distance, Radial Speed, Proper Motion

Alderamin is distant 48.77 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

14.96
48.77
-10 km/s
0.151 arcsec/y
0.049"/y

Alternative Designations

Alderamin
α Cephei
(alpha Cephei)
SAO19302
SAO19302

Visibility from Your Location

Alderamin - α Cephei (alpha Cephei) is circumpolar and transits at 05:30 UTC (altitude: 78.8°)