We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Your support keeps us free & ad-free » Donate
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:46  
clear_day Transit: 12:11  
SunsetSet: 17:36
sleep NighttimeWhat's Visible Now?
All Constellations » Cygnus » 


Altitude: 19.8°   Azimuth: 39.9°   Direction: North-East

HR7966 is a double giant star in the constellation of Cygnus.

HR7966 visual magnitude is 6.4. Because of its reltive faintness, HR7966 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR7966 is 0.005 arcsec per year in Right Ascension and -0.025 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7966 star
DSS2 image of HR7966. The red arrow shows the motion of HR7966 during the next 10000 years (0.83 arcmin in Right Ascension and -4.17 arcmin in declination);

Key facts about HR7966


HR7966 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 19.8°
Azimuth: 39.9°
Direction: North-East

Celestial coordinates and finder chart of HR7966

HR7966 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 HR7966 are provided in the following table:

20h 47m 20s
+45° 34’ 46”

The simplified sky map below shows the position of HR7966 in the sky:

Finder chart HR7966 star
Simplified finder chart for HR7966.

Visibility of HR7966 from your location

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

HR7966 is circumpolar and transits at 10:12 UTC (altitude: 84.1°)

Distance of HR7966 from the Sun and relative movement

HR7966 is distant 1,309.24 light years from the Sun and it is moving towards the Sun at the speed of 6 kilometers per second.

401.61 pc
1,309.24 ly
-6 km/s
0.005 arcsec/year
-0.025 arcsec/year

Spectral properties of HR7966

HR7966 belongs to spectral class K3 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR7966 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7966. Attribution: Richard Powell / CC BY-SA

HR7966 star system properties

HR7966 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 HR7966 double sysyem:

12.9 arcsec

Alternative designations of HR7966