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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 4:59 
Transit: 12:56 
Sunset: 20:54
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All Constellations » Cygnus » 

40 Cygni

Above the horizon.  Circumpolar today
Alt: 54.77°   Az: 267.41°   Direction: West

40 Cygni is a main-sequence star of spectral class A3 in the constellation of Cygnus.

40 Cygni visual magnitude is 5.62. Because of its faintness, 40 Cygni is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

Image of 40 Cygni star
DSS2 image of 40 Cygni. The red arrow shows the motion of 40 Cygni during the next 10000 years (-3.83 arcmin in Right Ascension and -11.67 arcmin in declination);

Celestial Coordinates

Apparent

20h 28m 30s
+38° 31’ 31”
03h 09m 46s
23h 38m 17s

J2000

20h 27m 34s
+38° 26’ 25”

Galactic Coordinates

77.26°
-0.02°

Finder Chart

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Finder chart for 40 Cygni.

Magnitude, Color, Spectral Class

5.62
Main-sequence

1.03
A3V
9434K

The red dot in the diagram below shows where 40 Cygni is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 40 Cygni. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

40 Cygni is distant 270.09 light years from the Sun

82.85
270.09
-0.023 arcsec/y
-0.07"/y

Alternative Designations

SAO70056
SAO70056

Visibility from Your Location

40 Cygni is circumpolar and transits at 04:28 UTC (altitude: 77.0°)