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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 7:01  
clear_day Transit: 12:12  
SunsetSet: 17:24
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All Constellations » Perseus » 

ω Persei (omega Persei)

Altitude: 23.8°   Azimuth: 55.7°   Direction: North-East

ω Persei is a double giant star in the constellation of Perseus.

ω Persei visual magnitude is 4.63. Because of its moderate brightness, ω Persei 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 proper motion of ω Persei is -0.023 arcsec per year in Right Ascension and 0.005 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ω Persei (omega Persei) star
DSS2 image of ω Persei. The red arrow shows the motion of ω Persei during the next 10000 years (-3.83 arcmin in Right Ascension and 0.83 arcmin in declination);

Key facts about ω Persei


ω Persei (omega Persei) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 23.8°
Azimuth: 55.7°
Direction: North-East

Celestial coordinates and finder chart of ω Persei

ω Persei is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of ω Persei are provided in the following table:

03h 11m 17s
+39° 36’ 42”

The simplified sky map below shows the position of ω Persei in the sky:

Finder chart ω Persei (omega Persei) star
Simplified finder chart for ω Persei (omega Persei).

Visibility of ω Persei from your location

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

ω Persei (omega Persei) is circumpolar and transits at 17:02 UTC (altitude: 78.1°)

Distance of ω Persei from the Sun and relative movement

ω Persei is distant 304.96 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

93.55 pc
304.96 ly
7 km/s
-0.023 arcsec/year
0.005 arcsec/year

Spectral properties of ω Persei

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


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

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

ω Persei star system properties

ω Persei is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the ω Persei double sysyem:

177.4 arcsec

Alternative designations of ω Persei

ω Persei
(omega Persei)