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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: 6:48  
clear_day Transit: 12:11  
SunsetSet: 17:34
wb_twilight Nautical TwilightWhat's Visible Now?
All Constellations » Cygnus » 


Altitude: 49.7°   Azimuth: 81.5°   Direction: East

HR7800 is a giant star in the constellation of Cygnus.

HR7800 visual magnitude is 5.93. Because of its reltive faintness, HR7800 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 HR7800 is 0.001 arcsec per year in Right Ascension and -0.047 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7800 star
DSS2 image of HR7800. The red arrow shows the motion of HR7800 during the next 10000 years (0.17 arcmin in Right Ascension and -7.83 arcmin in declination);

Key facts about HR7800


HR7800 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 49.7°
Azimuth: 81.5°
Direction: East

Celestial coordinates and finder chart of HR7800

HR7800 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 HR7800 are provided in the following table:

20h 22m 45s
+41° 01’ 33”

The simplified sky map below shows the position of HR7800 in the sky:

Finder chart HR7800 star
Simplified finder chart for HR7800.

Visibility of HR7800 from your location

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

HR7800 is circumpolar and transits at 09:51 UTC (altitude: 79.5°)

Distance of HR7800 from the Sun and relative movement

HR7800 is distant 855.64 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

262.47 pc
855.64 ly
1 km/s
0.001 arcsec/year
-0.047 arcsec/year

Spectral properties of HR7800

HR7800 belongs to spectral class K7 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR7800 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7800. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7800