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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:01 
Transit: 12:56 
Sunset: 20:52
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All Constellations » Cygnus » 

σ Cygni (sigma Cygni)

Above the horizon.  Circumpolar today
Alt: 1.17°   Az: 5.10°   Direction: North

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.

Image of σ Cygni (sigma Cygni) star
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

21h 18m 24s
+39° 30’ 07”
12h 26m 28s
09h 44m 53s

J2000

21h 17m 25s
+39° 23’ 40”

Galactic Coordinates

84.19°
-6.87°

Finder Chart

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Finder chart for σ Cygni (sigma Cygni).

Magnitude, Color, Spectral Class

4.23
Supergiant

-6.48
B9I
8839K

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

HR 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.

1,388.89
4,527.78
-4 km/s
0.001 arcsec/y
-0.003"/y

Alternative Designations

σ Cygni
(sigma Cygni)
SAO71165
SAO71165

Visibility from Your Location

σ Cygni (sigma Cygni) is circumpolar and transits at 05:21 UTC (altitude: 78.0°)