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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: 53.3°   Azimuth: 91.5°   Direction: East

HR7642 is a double sub-giant star in the constellation of Cygnus.

HR7642 visual magnitude is 6.32. Because of its reltive faintness, HR7642 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 HR7642 is 0.009 arcsec per year in Right Ascension and -0.004 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR7642 star
DSS2 image of HR7642. The red arrow shows the motion of HR7642 during the next 100000 years (15.00 arcmin in Right Ascension and -6.67 arcmin in declination);

Key facts about HR7642


HR7642 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 53.3°
Azimuth: 91.5°
Direction: East

Celestial coordinates and finder chart of HR7642

HR7642 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 HR7642 are provided in the following table:

19h 58m 34s
+38° 06’ 20”

The simplified sky map below shows the position of HR7642 in the sky:

Finder chart HR7642 star
Simplified finder chart for HR7642.

Visibility of HR7642 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 HR7642 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: 51.9°
Max altitude: 76.6°
Azimuth: 308.1°

Distance of HR7642 from the Sun and relative movement

HR7642 is distant 1,762.16 light years from the Sun and it is moving towards the Sun at the speed of 14 kilometers per second.

540.54 pc
1,762.16 ly
-14 km/s
0.009 arcsec/year
-0.004 arcsec/year

Spectral properties of HR7642

HR7642 belongs to spectral class B5 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR7642 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7642. Attribution: Richard Powell / CC BY-SA

HR7642 star system properties

HR7642 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR7642 double sysyem:

1.9 arcsec

Alternative designations of HR7642