We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Your support keeps us free & ad-free » Donate
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 7:01  
clear_day Transit: 12:12  
SunsetSet: 17:24
sunny DaytimeWhat's Visible Now?
All Constellations » Cygnus » 


Altitude: 37.5°   Azimuth: 293.4°   Direction: West-North-West

HR7638 is a multiple main-sequence star in the constellation of Cygnus.

HR7638 visual magnitude is 6.43. Because of its reltive faintness, HR7638 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 HR7638 is 0.001 arcsec per year in Right Ascension and -0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR7638 star
DSS2 image of HR7638. The red arrow shows the motion of HR7638 during the next 100000 years (1.67 arcmin in Right Ascension and -5.00 arcmin in declination);

Key facts about HR7638


HR7638 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 37.5°
Azimuth: 293.4°
Direction: West-North-West

Celestial coordinates and finder chart of HR7638

HR7638 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 HR7638 are provided in the following table:

19h 57m 56s
+42° 15’ 38”

The simplified sky map below shows the position of HR7638 in the sky:

Finder chart HR7638 star
Simplified finder chart for HR7638.

Visibility of HR7638 from your location

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

HR7638 is circumpolar and transits at 09:50 UTC (altitude: 80.8°)

Distance of HR7638 from the Sun and relative movement

HR7638 is distant 1,268.48 light years from the Sun and it is moving towards the Sun at the speed of 6 kilometers per second.

389.11 pc
1,268.48 ly
-6 km/s
0.001 arcsec/year
-0.003 arcsec/year

Spectral properties of HR7638

HR7638 belongs to spectral class A3 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR7638 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7638. Attribution: Richard Powell / CC BY-SA

HR7638 star system properties

HR7638 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 HR7638 double sysyem:

0.1 arcsec

Alternative designations of HR7638