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public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 12:59 
Sunset: 21:16
sunny   (Daytime)   What's Visible Now?

μ Cephei (mu Cephei)

Above the horizon.  Circumpolar today
Altitude: 82.5°   Azimuth: 347.4°   Direction: North-North-West

μ Cephei is a variable and multiple supergiant star of spectral class M2 in the constellation of Cepheus.

μ Cephei visual magnitude is 4.08. Because of its moderate brightness, μ Cephei is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Celestial coordinates and finder chart of μ Cephei

Finder chart μ Cephei (mu Cephei) star
Simplified finder chart for μ Cephei (mu Cephei).

μ Cephei is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of μ Cephei are provided in the following table:

21h 43m 30s
+58° 46’ 48”
Image of μ Cephei (mu Cephei) star
DSS2 image of μ Cephei. The red arrow shows the motion of μ Cephei during the next 100000 years (5.00 arcmin in Right Ascension and -5.00 arcmin in declination);

Key facts about μ Cephei


and has a luminosity class of I corresponding to a supergiant star.


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

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

μ Cephei star system properties

μ Cephei 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 μ Cephei double sysyem:

19.5 arcsec

Distance of μ Cephei from the Sun and relative movement

μ Cephei is distant 5,258.06 light years from the Sun and it is moving far from the Sun at the speed of 19 kilometers per second.

1,612.90 pc
5,258.06 ly
19 km/s
0.003 arcsec/year
-0.003 arcsec/year

Alternative designations of μ Cephei

μ Cephei
(mu Cephei)

Visibility of μ Cephei from your location

μ Cephei (mu Cephei) is circumpolar and transits at 04:07 UTC (altitude: 82.7°)