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Segin - ε Cassiopeiae (epsilon Cassiopeiae)

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:

Color of Segin ⬤

Magnitude of Segin 3.38

Class Giant

VISIBILITY RIGHT NOW Segin - ε Cassiopeiae (epsilon Cassiopeiae) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 45°.

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:

Right Ascension J2000 01h 54m 23s

Declination J2000 +63° 40’ 12”

Galactic Longitude 129.84°

Galactic Latitude 1.65°

Constellation Cassiopeia

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 [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Segin - ε Cassiopeiae (epsilon Cassiopeiae) is circumpolar and transits at 13:47 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.

Distance (parsec) 135.50 pc

Distance (light year) 441.73 ly

Heliocentric radial velocity -8 km/s

Proper Motion RA 0.032 arcsec/year

Proper Motion Dec -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.

Absolute magnitude -2.28

Spectral Type B3III

Color Index (B-V) -0.15

Temperature of Segin 12489K

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

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

Alternative designations of Segin

Proper Name Segin

Bayer designation ε Cassiopeiae
(epsilon Cassiopeiae)

Flamsteed designation 45 Cassiopeiae

Henry Draper Catalogue HD11415

SAO Catalogue SAO12031

Hipparcos Catalogue HIP8886

Durchmusterung Catalogue BD+62 320

FK5 Catalogue 63

General Catalogue of Variable Stars 652

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Other stars in Cassiopeia