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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: 6:40  
clear_day Transit: 12:10  
SunsetSet: 17:41
wb_twilight Nautical TwilightWhat's Visible Now?
All Constellations » Vulpecula » 


Altitude: 39.0°   Azimuth: 105.2°   Direction: East-South-East

HR7811 is a variable giant star in the constellation of Vulpecula.

HR7811 visual magnitude is 5.66. Because of its reltive faintness, HR7811 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 HR7811 is 0.01 arcsec per year in Right Ascension and -0.011 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7811 star
DSS2 image of HR7811. The red arrow shows the motion of HR7811 during the next 10000 years (1.67 arcmin in Right Ascension and -1.83 arcmin in declination);

Key facts about HR7811


HR7811 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 39.0°
Azimuth: 105.2°
Direction: East-South-East

Celestial coordinates and finder chart of HR7811

HR7811 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR7811 are provided in the following table:

20h 25m 40s
+21° 24’ 34”

The simplified sky map below shows the position of HR7811 in the sky:

Finder chart HR7811 star
Simplified finder chart for HR7811.

Visibility of HR7811 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 HR7811 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: 68.6°
Max altitude: 59.9°
Azimuth: 291.4°

Distance of HR7811 from the Sun and relative movement

HR7811 is distant 543.33 light years from the Sun and it is moving towards the Sun at the speed of 22 kilometers per second.

166.67 pc
543.33 ly
-22 km/s
0.01 arcsec/year
-0.011 arcsec/year

Spectral properties of HR7811

HR7811 belongs to spectral class G6 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR7811 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7811. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7811