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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: 6:40  
clear_day Transit: 12:10  
SunsetSet: 17:41
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All Constellations » Cepheus » 


Altitude: 22.5°   Azimuth: 15.7°   Direction: North-North-East

HR8164 is a multiple supergiant star in the constellation of Cepheus.

HR8164 visual magnitude is 5.66. Because of its reltive faintness, HR8164 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 HR8164 is 0.005 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR8164 star
DSS2 image of HR8164. The red arrow shows the motion of HR8164 during the next 100000 years (8.33 arcmin in Right Ascension and -1.67 arcmin in declination);

Key facts about HR8164


HR8164 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 22.5°
Azimuth: 15.7°
Direction: North-North-East

Celestial coordinates and finder chart of HR8164

HR8164 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 HR8164 are provided in the following table:

21h 19m 15s
+58° 37’ 24”

The simplified sky map below shows the position of HR8164 in the sky:

Finder chart HR8164 star
Simplified finder chart for HR8164.

Visibility of HR8164 from your location

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

HR8164 is circumpolar and transits at 10:32 UTC (altitude: 82.9°)

Distance of HR8164 from the Sun and relative movement

HR8164 is distant 3,662.92 light years from the Sun and it is moving towards the Sun at the speed of 21 kilometers per second.

1,123.60 pc
3,662.92 ly
-21 km/s
0.005 arcsec/year
-0.001 arcsec/year

Spectral properties of HR8164

HR8164 belongs to spectral class M1 and has a luminosity class of I corresponding to a supergiant star.


The red dot in the diagram below shows where HR8164 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR8164. Attribution: Richard Powell / CC BY-SA

HR8164 star system properties

HR8164 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR8164 double sysyem:

4.6 arcsec

Alternative designations of HR8164