σ Cygni (sigma Cygni)

Above the horizon. Circumpolar today

Alt: 38.73° Az: 72.43° Direction: East-North-East

σ Cygni is a variable supergiant star of spectral class B9 in the constellation of Cygnus.

σ Cygni visual magnitude is 4.23. Because of its moderate brightness, σ Cygni 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.

DSS2 image of σ Cygni. The red arrow shows the motion of σ Cygni during the next 100000 years (1.67 arcmin in Right Ascension and -5.00 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 21h 18m 25s

Declination +39° 30’ 10”

Hour Angle 19h 01m 45s

Sidereal Time 16h 20m 10s

J2000

Right Ascension 21h 17m 25s

Declination +39° 23’ 40”

Galactic Coordinates

Galactic Longitude 84.19°

Galactic Latitude -6.87°

Finder Chart

Loading map...

Finder chart for σ Cygni (sigma Cygni).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.23

Class Supergiant

Absolute magnitude -6.48

Spectral Type B9I

Color Index (B-V) 0.12

Temperature 8839K

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

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

Distance, Radial Speed, Proper Motion

σ Cygni is distant 4,527.78 light years from the Sun and it is moving towards the Sun at the speed of 4 kilometers per second.

Distance (parsec) 1,388.89

Distance (light year) 4,527.78

Radial Speed -4 km/s

Proper Motion RA 0.001 arcsec/y

Proper Motion Dec -0.003"/y

Alternative Designations

Bayer designation σ Cygni
(sigma Cygni)

Flamsteed designation 67 Cygni

Henry Draper Catalogue HD202850

SAO Catalogue SAO71165

Hipparcos Catalogue HIP105102

Durchmusterung Catalogue BD+38 4431

FK5 Catalogue 1558

General Catalogue of Variable Stars 13640

Visibility from Your Location

σ Cygni (sigma Cygni) is circumpolar and transits at 01:37 UTC (altitude: 78.0°)

In Evidence

Other stars in Cygnus

σ Cygni (sigma Cygni)

Celestial Coordinates

Apparent

J2000

Galactic Coordinates

Finder Chart

Magnitude, Color, Spectral Class

Distance, Radial Speed, Proper Motion

Alternative Designations

Visibility from Your Location

Set Location

In Evidence

Other stars in Cygnus

σ Cygni (sigma Cygni)

Celestial Coordinates

Apparent

J2000

Galactic Coordinates

Finder Chart

Magnitude, Color, Spectral Class

Distance, Radial Speed, Proper Motion

Alternative Designations

Visibility from Your Location