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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:10 
Transit: 12:56 
Sunset: 20:42
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All Constellations » Cepheus » 

μ Cephei (mu Cephei)

Above the horizon.  Circumpolar today
Alt: 71.13°   Az: 305.13°   Direction: 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.

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);

Celestial Coordinates

Apparent

21h 44m 17s
+58° 53’ 49”
02h 03m 10s
23h 47m 27s

J2000

21h 43m 30s
+58° 46’ 48”

Galactic Coordinates

100.6°
4.32°

Finder Chart

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Finder chart for μ Cephei (mu Cephei).

Magnitude, Color, Spectral Class

4.08
Supergiant

-6.96
M2I
2845K

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

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:

4.08
12.38
8.3
19.5 arcsec

Distance, Radial Speed, Proper Motion

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
5,258.06
19 km/s
0.003 arcsec/y
-0.003"/y

Alternative Designations

μ Cephei
(mu Cephei)
SAO33693
SAO33693

Visibility from Your Location

μ Cephei (mu Cephei) is circumpolar and transits at 06:15 UTC (altitude: 82.6°)