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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: 6:59  
clear_day Transit: 12:12  
SunsetSet: 17:25
sunny DaytimeWhat's Visible Now?
All Constellations » Cygnus » 


Altitude: 26.1°   Azimuth: 286.7°   Direction: West-North-West

HR7904 is a giant star in the constellation of Cygnus.

HR7904 visual magnitude is 5.68. Because of its reltive faintness, HR7904 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The proper motion of HR7904 is -0.032 arcsec per year in Right Ascension and -0.058 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7904 star
DSS2 image of HR7904. The red arrow shows the motion of HR7904 during the next 10000 years (-5.33 arcmin in Right Ascension and -9.67 arcmin in declination);

Key facts about HR7904


HR7904 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 26.1°
Azimuth: 286.7°
Direction: West-North-West

Celestial coordinates and finder chart of HR7904

HR7904 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 HR7904 are provided in the following table:

20h 38m 59s
+30° 20’ 03”

The simplified sky map below shows the position of HR7904 in the sky:

Finder chart HR7904 star
Simplified finder chart for HR7904.

Visibility of HR7904 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 HR7904 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: 59.7°
Max altitude: 68.9°
Azimuth: 300.3°

Distance of HR7904 from the Sun and relative movement

HR7904 is distant 386.26 light years from the Sun and it is moving far from the Sun at the speed of 13 kilometers per second.

118.48 pc
386.26 ly
13 km/s
-0.032 arcsec/year
-0.058 arcsec/year

Spectral properties of HR7904

HR7904 belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR7904 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7904. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7904