σ Cassiopeiae (sigma Cassiopeiae)

σ Cassiopeiae is a multiple main-sequence star in the constellation of Cassiopeia.

σ Cassiopeiae visual magnitude is 4.88. Because of its moderate brightness, σ Cassiopeiae 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 σ Cassiopeiae:

Color of σ Cassiopeiae ⬤

Magnitude of σ Cassiopeiae 4.88

Class Main-sequence

VISIBILITY RIGHT NOW σ Cassiopeiae (sigma Cassiopeiae) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 51°.

Celestial coordinates and finder chart of σ Cassiopeiae

σ 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 σ Cassiopeiae are provided in the following table:

Right Ascension J2000 23h 59m 00s

Declination J2000 +55° 45’ 18”

Galactic Longitude 115.55°

Galactic Latitude -6.36°

Constellation Cassiopeia

The simplified sky map below shows the position of σ Cassiopeiae in the sky:

Finder chart σ Cassiopeiae (sigma Cassiopeiae) star

Simplified finder chart for σ Cassiopeiae (sigma Cassiopeiae).

Visibility of σ Cassiopeiae from your location

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

σ Cassiopeiae (sigma Cassiopeiae) is circumpolar and transits at 07:28 UTC (altitude: 85.7°)

Digitized Sky Survey image of σ Cassiopeiae

The image below is a photograph of σ Cassiopeiae 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 σ Cassiopeiae is 0.009 arcsec per year in Right Ascension and -0.004 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of σ Cassiopeiae (sigma Cassiopeiae) star

DSS2 image of σ Cassiopeiae. The red arrow shows the motion of σ Cassiopeiae during the next 100000 years (15.00 arcmin in Right Ascension and -6.67 arcmin in declination);

Distance of σ Cassiopeiae from the Sun and relative movement

σ Cassiopeiae is distant 1,523.36 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

Distance (parsec) 467.29 pc

Distance (light year) 1,523.36 ly

Heliocentric radial velocity -13 km/s

Proper Motion RA 0.009 arcsec/year

Proper Motion Dec -0.004 arcsec/year

Spectral properties of σ Cassiopeiae

σ Cassiopeiae belongs to spectral class B1 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -3.47

Spectral Type B1V

Color Index (B-V) -0.07

Temperature of σ Cassiopeiae 11092K

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

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

σ Cassiopeiae star system properties

σ Cassiopeiae is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the σ Cassiopeiae double sysyem:

Main star magnitude 4.88

Secondary star magnitude 7.08

Magnitude difference 2.2

Separation 2.8 arcsec

Alternative designations of σ Cassiopeiae

Bayer designation σ Cassiopeiae
(sigma Cassiopeiae)

Flamsteed designation 8 Cassiopeiae

Henry Draper Catalogue HD224572

SAO Catalogue SAO35947

Hipparcos Catalogue HIP118243

Durchmusterung Catalogue BD+54 3082

Aitken Double Star Catalogue ADS17140

In Evidence

Other stars in Cassiopeia