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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: 7:50  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
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All Constellations » Cassiopeia » 

Segin - ε Cassiopeiae (epsilon Cassiopeiae)

Altitude: 76.4°   Azimuth: 22.0°   Direction: North-North-East

Segin, also designated as ε Cassiopeiae (epsilon Cassiopeiae), is a variable giant star in the constellation of Cassiopeia.

Segin visual magnitude is 3.38. Because of its moderate brightness, Segin 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 Segin:


Segin - ε Cassiopeiae (epsilon Cassiopeiae) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 76.4°
Azimuth: 22.0°
Direction: North-North-East

Celestial coordinates and finder chart of Segin

Segin 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 Segin are provided in the following table:

01h 54m 23s
+63° 40’ 12”

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

Finder chart Segin - ε Cassiopeiae (epsilon Cassiopeiae) star
Simplified finder chart for Segin - ε Cassiopeiae (epsilon Cassiopeiae).

Visibility of Segin from your location

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

Segin - ε Cassiopeiae (epsilon Cassiopeiae) is circumpolar and transits at 20:44 UTC (altitude: 77.8°)

Digitized Sky Survey image of Segin

The image below is a photograph of Segin 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 Segin is 0.032 arcsec per year in Right Ascension and -0.021 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Segin - ε Cassiopeiae (epsilon Cassiopeiae) star
DSS2 image of Segin. The red arrow shows the motion of Segin during the next 10000 years (5.33 arcmin in Right Ascension and -3.50 arcmin in declination);

Distance of Segin from the Sun and relative movement

Segin is distant 441.73 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

135.50 pc
441.73 ly
-8 km/s
0.032 arcsec/year
-0.021 arcsec/year

Spectral properties of Segin

Segin belongs to spectral class B3 and has a luminosity class of III corresponding to a giant star.


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

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

Alternative designations of Segin

ε Cassiopeiae
(epsilon Cassiopeiae)
45 Cassiopeiae