Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 5:59  ☀️ Transit: 12:05  🌅 Sunset: 18:13

4 Cephei

4 Cephei is a main-sequence star in the constellation of Cepheus.

4 Cephei visual magnitude is 5.58. Because of its reltive faintness, 4 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 4 Cephei:

4 Cephei is above the horizon from Greenwich, United Kingdom [change]. Altitude: 29°.

Celestial coordinates and finder chart of 4 Cephei

4 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 4 Cephei are provided in the following table:

20h 43m 10s
+66° 39’ 26”

The simplified sky map below shows the position of 4 Cephei in the sky:

Finder chart 4 Cephei star
Simplified finder chart for 4 Cephei.

Visibility of 4 Cephei from your location

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

4 Cephei is circumpolar and transits at 08:44 UTC (altitude: 74.8°)

Digitized Sky Survey image of 4 Cephei

The image below is a photograph of 4 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 4 Cephei is 0.021 arcsec per year in Right Ascension and 0.032 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 4 Cephei star
DSS2 image of 4 Cephei. The red arrow shows the motion of 4 Cephei during the next 10000 years (3.50 arcmin in Right Ascension and 5.33 arcmin in declination);

Distance of 4 Cephei from the Sun and relative movement

4 Cephei is distant 138.78 light years from the Sun and it is moving towards the Sun at the speed of 11 kilometers per second.

42.57 pc
138.78 ly
-11 km/s
0.021 arcsec/year
0.032 arcsec/year

Spectral properties of 4 Cephei

4 Cephei belongs to spectral class A8 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where 4 Cephei is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 4 Cephei. Attribution: Richard Powell / CC BY-SA

Alternative designations of 4 Cephei