ζ Cephei (zeta Cephei)

Above the horizon. Circumpolar today

Alt: 43.40° Az: 46.15° Direction: North-East

ζ Cephei is a variable supergiant star of spectral class K1 in the constellation of Cepheus.

ζ Cephei visual magnitude is 3.35. Because of its moderate brightness, ζ 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.

DSS2 image of ζ Cephei. The red arrow shows the motion of ζ Cephei during the next 10000 years (2.50 arcmin in Right Ascension and 0.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 22h 11m 43s

Declination +58° 19’ 31”

Hour Angle 18h 14m 52s

Sidereal Time 16h 26m 36s

J2000

Right Ascension 22h 10m 51s

Declination +58° 12’ 03”

Galactic Coordinates

Galactic Longitude 103.06°

Galactic Latitude 1.67°

Finder Chart

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Finder chart for ζ Cephei (zeta Cephei).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 3.35

Class Supergiant

Absolute magnitude -3.39

Spectral Type K1I

Color Index (B-V) 1.57

Temperature 3691K

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

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

Distance, Radial Speed, Proper Motion

ζ Cephei is distant 726.06 light years from the Sun and it is moving towards the Sun at the speed of 18 kilometers per second.

Distance (parsec) 222.72

Distance (light year) 726.06

Radial Speed -18 km/s

Proper Motion RA 0.015 arcsec/y

Proper Motion Dec 0.004"/y

Alternative Designations

Bayer designation ζ Cephei
(zeta Cephei)

Flamsteed designation 21 Cephei

Henry Draper Catalogue HD210745

SAO Catalogue SAO34137

Hipparcos Catalogue HIP109492

Durchmusterung Catalogue BD+57 2475

FK5 Catalogue 836

General Catalogue of Variable Stars 14066

Visibility from Your Location

ζ Cephei (zeta Cephei) is circumpolar and transits at 12:56 UTC (altitude: 83.2°)

Set Location

Other stars in Cepheus