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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:12 
Transit: 13:06 
Sunset: 20:59
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All Constellations » Cygnus » 

51 Cygni

Above the horizon.  Circumpolar today
Alt: 52.60°   Az: 293.25°   Direction: West-North-West

51 Cygni is a multiple main-sequence star of spectral class B2 in the constellation of Cygnus.

51 Cygni visual magnitude is 5.39. Because of its faintness, 51 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 51 Cygni star
DSS2 image of 51 Cygni. The red arrow shows the motion of 51 Cygni during the next 100000 years (5.00 arcmin in Right Ascension and 8.33 arcmin in declination);

Celestial Coordinates

Apparent

20h 42m 58s
+50° 25’ 44”
04h 04m 42s
00h 47m 40s

J2000

20h 42m 12s
+50° 20’ 24”

Galactic Coordinates

88.37°
4.99°

Finder Chart

Finder chart 51 Cygni star
Simplified finder chart for 51 Cygni.

Magnitude, Color, Spectral Class

5.39
Main-sequence

-1.87
B2V
11573K

The red dot in the diagram below shows where 51 Cygni is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 51 Cygni. Attribution: Richard Powell / CC BY-SA

Star System Properties

51 Cygni is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the 51 Cygni double sysyem:

5.39
11.39
6
3 arcsec

Distance, Radial Speed, Proper Motion

51 Cygni is distant 923.51 light years from the Sun and it is moving towards the Sun at the speed of 3 kilometers per second.

283.29
923.51
-3 km/s
0.003 arcsec/y
0.005"/y

Alternative Designations

SAO32809
SAO32809

Visibility from Your Location

51 Cygni is circumpolar and transits at 00:37 UTC (altitude: 88.9°)