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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
north SunriseRise: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
wb_twilight Nautical TwilightWhat's Visible Now?
All Constellations » Cassiopeia » 


Altitude: 64.1°   Azimuth: 43.6°   Direction: North-East

HR233 is a variable hypergiant star in the constellation of Cassiopeia.

HR233 visual magnitude is 5.39. Because of its reltive faintness, HR233 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about HR233:


HR233 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 64.1°
Azimuth: 43.6°
Direction: North-East

Celestial coordinates and finder chart of HR233

HR233 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR233 are provided in the following table:

00h 50m 43s
+64° 14’ 51”

The simplified sky map below shows the position of HR233 in the sky:

Finder chart HR233 star
Simplified finder chart for HR233.

Visibility of HR233 from your location

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

HR233 is circumpolar and transits at 19:29 UTC (altitude: 77.2°)

Digitized Sky Survey image of HR233

The image below is a photograph of HR233 from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of HR233 is 0.03 arcsec per year in Right Ascension and -0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR233 star
DSS2 image of HR233. The red arrow shows the motion of HR233 during the next 10000 years (5.00 arcmin in Right Ascension and -2.00 arcmin in declination);

Distance of HR233 from the Sun and relative movement

HR233 is distant 812.97 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

249.38 pc
812.97 ly
3 km/s
0.03 arcsec/year
-0.012 arcsec/year

Spectral properties of HR233

HR233 belongs to spectral class G0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR233 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR233. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR233