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:

Color of 4 Cephei ⬤

Magnitude of 4 Cephei 5.58

Class Main-sequence

VISIBILITY RIGHT NOW 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:

Right Ascension J2000 20h 43m 10s

Declination J2000 +66° 39’ 26”

Galactic Longitude 101.72°

Galactic Latitude 14.68°

Constellation Cepheus

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

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.

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.

Distance (parsec) 42.57 pc

Distance (light year) 138.78 ly

Heliocentric radial velocity -11 km/s

Proper Motion RA 0.021 arcsec/year

Proper Motion Dec 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.

Absolute magnitude 2.43

Spectral Type A8V

Color Index (B-V) 0.22

Temperature of 4 Cephei 8011K

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

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

Alternative designations of 4 Cephei

Flamsteed designation 4 Cephei

Henry Draper Catalogue HD197950

SAO Catalogue SAO19004

Hipparcos Catalogue HIP102253

Durchmusterung Catalogue BD+66 1318

FK5 Catalogue 3656

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Other stars in Cepheus