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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
north SunriseRise: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
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All Constellations » Cassiopeia » 

Caph - β Cassiopeiae (beta Cassiopeiae)

Altitude: 39.9°   Azimuth: 41.7°   Direction: North-East

Caph, also designated as β Cassiopeiae (beta Cassiopeiae), is a variable and double giant star in the constellation of Cassiopeia.

Caph visual magnitude is 2.27, making it the 73th brightest star in the sky. Thanks to its high brightness, Caph is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Caph:


Caph - β Cassiopeiae (beta Cassiopeiae) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 39.9°
Azimuth: 41.7°
Direction: North-East

Celestial coordinates and finder chart of Caph

Caph 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 Caph are provided in the following table:

00h 09m 10s
+59° 08’ 58”

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

Finder chart Caph - β Cassiopeiae (beta Cassiopeiae) star
Simplified finder chart for Caph - β Cassiopeiae (beta Cassiopeiae).

Visibility of Caph from your location

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

Caph - β Cassiopeiae (beta Cassiopeiae) is circumpolar and transits at 19:27 UTC (altitude: 82.3°)

Digitized Sky Survey image of Caph

The image below is a photograph of Caph 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 Caph is 0.525 arcsec per year in Right Ascension and -0.181 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Caph - β Cassiopeiae (beta Cassiopeiae) star
DSS2 image of Caph. The red arrow shows the motion of Caph during the next 1000 years (8.75 arcmin in Right Ascension and -3.02 arcmin in declination);

Distance of Caph from the Sun and relative movement

Caph is distant 54.43 light years from the Sun and it is moving far from the Sun at the speed of 12 kilometers per second.

16.70 pc
54.43 ly
12 km/s
0.525 arcsec/year
-0.181 arcsec/year

Spectral properties of Caph

Caph belongs to spectral class F2 and has a luminosity class of III corresponding to a giant star.


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

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

Caph star system properties

Caph 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 Caph double sysyem:

31.3 arcsec

Alternative designations of Caph

β Cassiopeiae
(beta Cassiopeiae)
11 Cassiopeiae