27 Cygni

Below the horizon. Rise: 11:13 | Tran: 21:33 | Set: 7:58

Alt: -2.39° Az: 3.53° Direction: North

27 Cygni is a variable and multiple hypergiant star of spectral class K0 in the constellation of Cygnus.

27 Cygni visual magnitude is 5.36. Because of its faintness, 27 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.

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);

Celestial Coordinates

Apparent

Right Ascension 20h 07m 17s

Declination +36° 02’ 41”

Hour Angle 12h 17m 27s

Sideral Time 08h 24m 45s

J2000

Right Ascension 20h 06m 21s

Declination +35° 58’ 20”

Galactic Coordinates

Galactic Longitude 72.86°

Galactic Latitude 2.1°

Finder Chart

Simplified finder chart for 27 Cygni.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.36

Class Hypergiant

Absolute magnitude 3.44

Spectral Type K0IV

Color Index (B-V) 0.85

Temperature 5134K

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

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

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:

Main star magnitude 5.36

Secondary star magnitude 9.36

Magnitude difference 4

Separation 11.9 arcsec

Distance, Radial Speed, Proper Motion

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.

Distance (parsec) 24.19

Distance (light year) 78.86

Radial Speed -33 km/s

Proper Motion RA -0.224 arcsec/y

Proper Motion Dec -0.438"/y

Alternative Designations

Flamsteed designation 27 Cygni

Henry Draper Catalogue HD191026

SAO Catalogue SAO69413

Hipparcos Catalogue HIP99031

Durchmusterung Catalogue BD+35 3959

General Catalogue of Variable Stars Var?

Visibility from Your Location

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

Azimuth: 54.0° RISE 11:13

Max altitude: 74.6° TRANSIT 21:33

Azimuth: 306.0° SET 7:58

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Cygnus