Alderamin - α Cephei (alpha Cephei)
Alderamin, also designated as α Cephei (alpha Cephei), is a variable and multiple main-sequence star in the constellation of Cepheus.
Alderamin visual magnitude is 2.44, making it the 86th brightest star in the sky. Thanks to its high brightness, Alderamin is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.
The table below summarizes the key facts about Alderamin:
Celestial coordinates and finder chart of Alderamin
Alderamin is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Alderamin are provided in the following table:
The simplified sky map below shows the position of Alderamin in the sky:
Visibility of Alderamin from your location
Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Alderamin - α Cephei (alpha Cephei) is circumpolar and transits at 09:16 UTC (altitude: 78.9°)
Digitized Sky Survey image of Alderamin
The image below is a photograph of Alderamin from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of Alderamin is 0.151 arcsec per year in Right Ascension and 0.049 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.
Distance of Alderamin from the Sun and relative movement
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.
Spectral properties of Alderamin
Alderamin belongs to spectral class A7 and has a luminosity class of V corresponding to a main-sequence star.
The red dot in the diagram below shows where Alderamin is situated in the Hertzsprung–Russell diagram.
Alderamin 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: