ο Cephei (omicron Cephei)

Above the horizon. Rise: 19:37 | Tran: 3:59 | Set: 12:24

Alt: 0.77° Az: 342.01° Direction: North-North-West

ο Cephei is a variable and multiple hypergiant star of spectral class K0 in the constellation of Cepheus.

ο Cephei visual magnitude is 4.75. Because of its moderate brightness, ο 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 ο Cephei. The red arrow shows the motion of ο Cephei during the next 10000 years (9.67 arcmin in Right Ascension and 2.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 23h 19m 40s

Declination +68° 15’ 05”

Hour Angle 08h 14m 07s

Sidereal Time 07h 33m 48s

J2000

Right Ascension 23h 18m 37s

Declination +68° 06’ 42”

Galactic Coordinates

Galactic Longitude 114.42°

Galactic Latitude 6.79°

Finder Chart

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Finder chart for ο Cephei (omicron Cephei).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.75

Class Hypergiant

Absolute magnitude 0.70

Spectral Type K0III

Color Index (B-V) 0.84

Temperature 5163K

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

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

Star System Properties

ο Cephei is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the ο Cephei double sysyem:

Main star magnitude 4.75

Secondary star magnitude 7.05

Magnitude difference 2.3

Separation 3.1 arcsec

Distance, Radial Speed, Proper Motion

ο Cephei is distant 210.59 light years from the Sun and it is moving towards the Sun at the speed of 18 kilometers per second.

Distance (parsec) 64.60

Distance (light year) 210.59

Radial Speed -18 km/s

Proper Motion RA 0.058 arcsec/y

Proper Motion Dec 0.016"/y

Alternative Designations

Bayer designation ο Cephei
(omicron Cephei)

Flamsteed designation 34 Cephei

Henry Draper Catalogue HD219916

SAO Catalogue SAO20554

Hipparcos Catalogue HIP115088

Durchmusterung Catalogue BD+67 1514

General Catalogue of Variable Stars 14495

Aitken Double Star Catalogue ADS16666

Visibility from Your Location

Today's ο Cephei (omicron Cephei) rise, transit and set times from Aurora, Filipinas are the following (all times relative to the local timezone Asia/Manila):

Azimuth: 21.7° RISE 19:37

Max altitude: 35.0° TRANSIT 3:59

Azimuth: 338.3° SET 12:24

Name:	Aurora, Filipinas
Latitude:	13° 13' 55.9" N
Longitude:	121° 7' 12.0" E
Timezone:	Asia/Manila

Set Location

Other stars in Cepheus