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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
north SunriseRise: 7:47  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
wb_twilight Astronomical TwilightWhat's Visible Now?
All Constellations » Cygnus » 


Altitude: 7.0°   Azimuth: 29.2°   Direction: North-North-East

HR7784 is a multiple main-sequence star in the constellation of Cygnus.

HR7784 visual magnitude is 6.23. Because of its reltive faintness, HR7784 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about HR7784:


HR7784 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 7.0°
Azimuth: 29.2°
Direction: North-North-East

Celestial coordinates and finder chart of HR7784

HR7784 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 HR7784 are provided in the following table:

20h 20m 15s
+39° 24’ 11”

The simplified sky map below shows the position of HR7784 in the sky:

Finder chart HR7784 star
Simplified finder chart for HR7784.

Visibility of HR7784 from your location

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

HR7784 is circumpolar and transits at 15:23 UTC (altitude: 77.9°)

Digitized Sky Survey image of HR7784

The image below is a photograph of HR7784 from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of HR7784 is -0.002 arcsec per year in Right Ascension and -0.022 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7784 star
DSS2 image of HR7784. The red arrow shows the motion of HR7784 during the next 10000 years (-0.33 arcmin in Right Ascension and -3.67 arcmin in declination);

Distance of HR7784 from the Sun and relative movement

HR7784 is distant 355.12 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

108.93 pc
355.12 ly
-1 km/s
-0.002 arcsec/year
-0.022 arcsec/year

Spectral properties of HR7784

HR7784 belongs to spectral class A1 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR7784 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7784. Attribution: Richard Powell / CC BY-SA

HR7784 star system properties

HR7784 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 HR7784 double sysyem:

0.3 arcsec

Alternative designations of HR7784