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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: 7:38  
clear_day Transit: 11:46  
SunsetSet: 15:54 south
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All Constellations » Cygnus » 

31 Cygni

Altitude: 29.3°   Azimuth: 50.5°   Direction: North-East

31 Cygni is a variable and multiple bright giant star in the constellation of Cygnus.

31 Cygni visual magnitude is 3.79. Because of its moderate brightness, 31 Cygni 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 31 Cygni:

Bright giant

31 Cygni is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 29.3°
Azimuth: 50.5°
Direction: North-East

Celestial coordinates and finder chart of 31 Cygni

31 Cygni 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 31 Cygni are provided in the following table:

20h 13m 37s
+46° 44’ 29”

The simplified sky map below shows the position of 31 Cygni in the sky:

Finder chart 31 Cygni star
Simplified finder chart for 31 Cygni.

Visibility of 31 Cygni from your location

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

31 Cygni is circumpolar and transits at 15:40 UTC (altitude: 85.3°)

Digitized Sky Survey image of 31 Cygni

The image below is a photograph of 31 Cygni 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 31 Cygni is 0.004 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of 31 Cygni star
DSS2 image of 31 Cygni. The red arrow shows the motion of 31 Cygni during the next 100000 years (6.67 arcmin in Right Ascension and 5.00 arcmin in declination);

Distance of 31 Cygni from the Sun and relative movement

31 Cygni is distant 1,352.70 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

414.94 pc
1,352.70 ly
-8 km/s
0.004 arcsec/year
0.003 arcsec/year

Spectral properties of 31 Cygni

31 Cygni belongs to spectral class K2 and has a luminosity class of II corresponding to a bright giant star.


The red dot in the diagram below shows where 31 Cygni is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 31 Cygni. Attribution: Richard Powell / CC BY-SA

31 Cygni star system properties

31 Cygni is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the 31 Cygni double sysyem:

337.5 arcsec

Alternative designations of 31 Cygni