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public LocationGreenwich, UK
Sunrise: 4:42 
Transit: 13:00 
Sunset: 21:17
sunny   (Daytime)   What's Visible Now?


Above the horizon.  Circumpolar today
Altitude: 28.2°   Azimuth: 37.5°   Direction: North-East

HR7791 is a multiple giant star of spectral class K4 in the constellation of Cygnus.

HR7791 visual magnitude is 6.18. Because of its faintness, HR7791 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.

Celestial coordinates and finder chart of HR7791

Finder chart HR7791 star
Simplified finder chart for HR7791.

HR7791 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 HR7791 are provided in the following table:

20h 20m 30s
+53° 35’ 45”
Image of HR7791 star
DSS2 image of HR7791. The red arrow shows the motion of HR7791 during the next 10000 years (-2.67 arcmin in Right Ascension and 2.33 arcmin in declination);

Key facts about HR7791


and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR7791 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7791. Attribution: Richard Powell / CC BY-SA

HR7791 star system properties

HR7791 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 HR7791 double sysyem:

6.5 arcsec

Distance of HR7791 from the Sun and relative movement

HR7791 is distant 1,630.00 light years from the Sun and it is moving towards the Sun at the speed of 4 kilometers per second.

500.00 pc
1,630.00 ly
-4 km/s
-0.016 arcsec/year
0.014 arcsec/year

Alternative designations of HR7791


Visibility of HR7791 from your location

HR7791 is circumpolar and transits at 02:25 UTC (altitude: 87.9°)