Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
sunny DaytimeWhat's Visible Now
All Constellations » Cygnus » 

27 Cygni

Altitude: 11.5°   Azimuth: 315.0°   Direction: North-West

27 Cygni is a variable and multiple hypergiant star in the constellation of Cygnus.

27 Cygni visual magnitude is 5.36. Because of its reltive faintness, 27 Cygni should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 27 Cygni:


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

Altitude: 11.5°
Azimuth: 315.0°
Direction: North-West

Celestial coordinates and finder chart of 27 Cygni

27 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 27 Cygni are provided in the following table:

20h 06m 21s
+35° 58’ 20”

The simplified sky map below shows the position of 27 Cygni in the sky:

Finder chart 27 Cygni star
Simplified finder chart for 27 Cygni.

Visibility of 27 Cygni from your location

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

Today's 27 Cygni rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 54.0°
Max altitude: 74.5°
Azimuth: 306.0°
27 Cygni is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 27 Cygni

The image below is a photograph of 27 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 27 Cygni is -0.224 arcsec per year in Right Ascension and -0.438 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 27 Cygni star
DSS2 image of 27 Cygni. The red arrow shows the motion of 27 Cygni during the next 1000 years (-3.73 arcmin in Right Ascension and -7.30 arcmin in declination);

Distance of 27 Cygni from the Sun and relative movement

27 Cygni is distant 78.86 light years from the Sun and it is moving towards the Sun at the speed of 33 kilometers per second.

24.19 pc
78.86 ly
-33 km/s
-0.224 arcsec/year
-0.438 arcsec/year

Spectral properties of 27 Cygni

27 Cygni belongs to spectral class K0 and has a luminosity class of IV corresponding to a hypergiant star.


The red dot in the diagram below shows where 27 Cygni is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 27 Cygni. Attribution: Richard Powell / CC BY-SA

27 Cygni star system properties

27 Cygni is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the 27 Cygni double sysyem:

11.9 arcsec

Alternative designations of 27 Cygni