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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:35  
clear_day Transit: 12:10  
SunsetSet: 17:45
sunny DaytimeWhat's Visible Now?
All Constellations » Cygnus » 


Altitude: 55.7°   Azimuth: 244.9°   Direction: West-South-West

HR7917 is a double main-sequence star in the constellation of Cygnus.

HR7917 visual magnitude is 6.08. Because of its reltive faintness, HR7917 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 HR7917 is 0.008 arcsec per year in Right Ascension and 0.036 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7917 star
DSS2 image of HR7917. The red arrow shows the motion of HR7917 during the next 10000 years (1.33 arcmin in Right Ascension and 6.00 arcmin in declination);

Key facts about HR7917


HR7917 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 55.7°
Azimuth: 244.9°
Direction: West-South-West

Celestial coordinates and finder chart of HR7917

HR7917 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 HR7917 are provided in the following table:

20h 40m 36s
+29° 48’ 19”

The simplified sky map below shows the position of HR7917 in the sky:

Finder chart HR7917 star
Simplified finder chart for HR7917.

Visibility of HR7917 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 HR7917 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: 60.2°
Max altitude: 68.3°
Azimuth: 299.8°

Distance of HR7917 from the Sun and relative movement

HR7917 is distant 267.21 light years from the Sun and it is moving towards the Sun at the speed of 30 kilometers per second.

81.97 pc
267.21 ly
-30 km/s
0.008 arcsec/year
0.036 arcsec/year

Spectral properties of HR7917

HR7917 belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR7917 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7917. Attribution: Richard Powell / CC BY-SA

HR7917 star system properties

HR7917 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR7917 double sysyem:

0.9 arcsec

Alternative designations of HR7917