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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
sunny DaytimeWhat's Visible Now?
All Constellations » Perseus » 


Altitude: 62.8°   Azimuth: 99.2°   Direction: East

HR923 is a hypergiant star in the constellation of Perseus.

HR923 visual magnitude is 6.05. Because of its reltive faintness, HR923 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 HR923 is -0.053 arcsec per year in Right Ascension and 0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR923 star
DSS2 image of HR923. The red arrow shows the motion of HR923 during the next 10000 years (-8.83 arcmin in Right Ascension and 0.17 arcmin in declination);

Key facts about HR923


HR923 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 62.8°
Azimuth: 99.2°
Direction: East

Celestial coordinates and finder chart of HR923

HR923 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 HR923 are provided in the following table:

03h 05m 20s
+40° 34’ 57”

The simplified sky map below shows the position of HR923 in the sky:

Finder chart HR923 star
Simplified finder chart for HR923.

Visibility of HR923 from your location

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

HR923 is circumpolar and transits at 16:29 UTC (altitude: 79.1°)

Distance of HR923 from the Sun and relative movement

HR923 is distant 408.01 light years from the Sun and it is moving towards the Sun at the speed of 34 kilometers per second.

125.16 pc
408.01 ly
-34 km/s
-0.053 arcsec/year
0.001 arcsec/year

Spectral properties of HR923

HR923 belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR923 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR923. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR923