Errai - γ Cephei (gamma Cephei)

Errai, also designated as γ Cephei (gamma Cephei), is a variable giant star in the constellation of Cepheus.

Errai visual magnitude is 3.21. Because of its moderate brightness, Errai should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about Errai:

Color of Errai ⬤

Magnitude of Errai 3.21

Class Giant

VISIBILITY RIGHT NOW Errai - γ Cephei (gamma Cephei) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 58°.

Celestial coordinates and finder chart of Errai

Errai 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 Errai are provided in the following table:

Right Ascension J2000 23h 39m 20s

Declination J2000 +77° 37’ 56”

Galactic Longitude 118.99°

Galactic Latitude 15.31°

Constellation Cepheus

The simplified sky map below shows the position of Errai in the sky:

Finder chart Errai - γ Cephei (gamma Cephei) star

Simplified finder chart for Errai - γ Cephei (gamma Cephei).

Visibility of Errai from your location

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

Errai - γ Cephei (gamma Cephei) is circumpolar and transits at 11:28 UTC (altitude: 63.8°)

Digitized Sky Survey image of Errai

The image below is a photograph of Errai 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 Errai is -0.067 arcsec per year in Right Ascension and 0.151 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Errai - γ Cephei (gamma Cephei) star

DSS2 image of Errai. The red arrow shows the motion of Errai during the next 1000 years (-1.12 arcmin in Right Ascension and 2.52 arcmin in declination);

Distance of Errai from the Sun and relative movement

Errai is distant 44.97 light years from the Sun and it is moving towards the Sun at the speed of 42 kilometers per second.

Distance (parsec) 13.79 pc

Distance (light year) 44.97 ly

Heliocentric radial velocity -42 km/s

Proper Motion RA -0.067 arcsec/year

Proper Motion Dec 0.151 arcsec/year

Spectral properties of Errai

Errai belongs to spectral class K1 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 2.51

Spectral Type K1III

Color Index (B-V) 1.03

Temperature of Errai 4672K

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

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

Alternative designations of Errai

Proper Name Errai

Bayer designation γ Cephei
(gamma Cephei)

Flamsteed designation 35 Cephei

Henry Draper Catalogue HD222404

SAO Catalogue SAO10818

Hipparcos Catalogue HIP116727

Durchmusterung Catalogue BD+76 928

Gliese Catalogue Gl 903

FK5 Catalogue 893

General Catalogue of Variable Stars 14656

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