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public LocationGreenwich, UK
Sunrise: 4:43 
Transit: 13:01 
Sunset: 21:18
wb_twilight   (Nautical Twilight)   What's Visible Now?
All Constellations » Cassiopeia » 

ο Cassiopeiae (omicron Cassiopeiae)

Above the horizon.  Circumpolar today
Altitude: 48.3°   Azimuth: 67.0°   Direction: East-North-East

ο Cassiopeiae is a variable and double giant star of spectral class B5 in the constellation of Cassiopeia.

ο Cassiopeiae visual magnitude is 4.54. Because of its moderate brightness, ο Cassiopeiae 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.

Celestial coordinates and finder chart of ο Cassiopeiae

Finder chart ο Cassiopeiae (omicron Cassiopeiae) star
Simplified finder chart for ο Cassiopeiae (omicron Cassiopeiae).

ο Cassiopeiae 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 ο Cassiopeiae are provided in the following table:

00h 44m 43s
+48° 17’ 03”
Image of ο Cassiopeiae (omicron Cassiopeiae) star
DSS2 image of ο Cassiopeiae. The red arrow shows the motion of ο Cassiopeiae during the next 10000 years (3.17 arcmin in Right Ascension and -1.33 arcmin in declination);

Key facts about ο Cassiopeiae


and has a luminosity class of III corresponding to a giant star.


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

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

ο Cassiopeiae star system properties

ο Cassiopeiae 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 ο Cassiopeiae double sysyem:

33.6 arcsec

Distance of ο Cassiopeiae from the Sun and relative movement

ο Cassiopeiae is distant 905.56 light years from the Sun and it is moving towards the Sun at the speed of 17 kilometers per second.

277.78 pc
905.56 ly
-17 km/s
0.019 arcsec/year
-0.008 arcsec/year

Alternative designations of ο Cassiopeiae

ο Cassiopeiae
(omicron Cassiopeiae)
22 Cassiopeiae

Visibility of ο Cassiopeiae from your location

ο Cassiopeiae (omicron Cassiopeiae) is circumpolar and transits at 06:29 UTC (altitude: 86.8°)