Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:47  
clear_day Transit: 12:50  
SunsetSet: 18:52 south
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All Constellations » Cepheus » 

31 Cephei

Altitude: 35.2°   Azimuth: 358.6°   Direction: North

31 Cephei is a giant star in the constellation of Cepheus.

31 Cephei visual magnitude is 5.08. Because of its reltive faintness, 31 Cephei should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 31 Cephei:


31 Cephei is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 35.2°
Azimuth: 358.6°
Direction: North

Celestial coordinates and finder chart of 31 Cephei

31 Cephei 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 31 Cephei are provided in the following table:

22h 35m 46s
+73° 38’ 35”

The simplified sky map below shows the position of 31 Cephei in the sky:

Finder chart 31 Cephei star
Simplified finder chart for 31 Cephei.

Visibility of 31 Cephei from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

31 Cephei is circumpolar and transits at 22:21 UTC (altitude: 67.8°)

Digitized Sky Survey image of 31 Cephei

The image below is a photograph of 31 Cephei 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 31 Cephei is 0.172 arcsec per year in Right Ascension and 0.023 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 31 Cephei star
DSS2 image of 31 Cephei. The red arrow shows the motion of 31 Cephei during the next 1000 years (2.87 arcmin in Right Ascension and 0.38 arcmin in declination);

Distance of 31 Cephei from the Sun and relative movement

31 Cephei is distant 184.18 light years from the Sun

56.50 pc
184.18 ly
0.172 arcsec/year
0.023 arcsec/year

Spectral properties of 31 Cephei

31 Cephei belongs to spectral class F3 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 31 Cephei is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 31 Cephei. Attribution: Richard Powell / CC BY-SA

Alternative designations of 31 Cephei