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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: 6:46  
clear_day Transit: 12:11  
SunsetSet: 17:36
sleep NighttimeWhat's Visible Now?
All Constellations » Cygnus » 


Altitude: 11.3°   Azimuth: 328.1°   Direction: North-North-West

HR8138 is a star in the constellation of Cygnus.

HR8138 visual magnitude is 6.43. Because of its reltive faintness, HR8138 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 HR8138 is 0.003 arcsec per year in Right Ascension and -0.028 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR8138 star
DSS2 image of HR8138. The red arrow shows the motion of HR8138 during the next 10000 years (0.50 arcmin in Right Ascension and -4.67 arcmin in declination);

Key facts about HR8138


HR8138 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 11.3°
Azimuth: 328.1°
Direction: North-North-West

Celestial coordinates and finder chart of HR8138

HR8138 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 HR8138 are provided in the following table:

21h 16m 29s
+42° 15’ 05”

The simplified sky map below shows the position of HR8138 in the sky:

Finder chart HR8138 star
Simplified finder chart for HR8138.

Visibility of HR8138 from your location

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

HR8138 is circumpolar and transits at 10:41 UTC (altitude: 80.8°)

Distance of HR8138 from the Sun and relative movement

HR8138 is distant 864.72 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

265.25 pc
864.72 ly
8 km/s
0.003 arcsec/year
-0.028 arcsec/year

Spectral properties of HR8138

HR8138 belongs to spectral class K2


The red dot in the diagram below shows where HR8138 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR8138. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR8138