Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
sunny DaytimeWhat's Visible Now
All Constellations » Cassiopeia » 


Altitude: 21.0°   Azimuth: 338.6°   Direction: North-North-West

HR204 is a giant star in the constellation of Cassiopeia.

HR204 visual magnitude is 6.52. Because of its reltive faintness, HR204 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 HR204:


HR204 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 21.0°
Azimuth: 338.6°
Direction: North-North-West

Celestial coordinates and finder chart of HR204

HR204 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 HR204 are provided in the following table:

00h 46m 15s
+55° 18’ 19”

The simplified sky map below shows the position of HR204 in the sky:

Finder chart HR204 star
Simplified finder chart for HR204.

Visibility of HR204 from your location

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

HR204 is circumpolar and transits at 07:56 UTC (altitude: 86.2°)

Digitized Sky Survey image of HR204

The image below is a photograph of HR204 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 HR204 is 0.015 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 HR204 star
DSS2 image of HR204. The red arrow shows the motion of HR204 during the next 10000 years (2.50 arcmin in Right Ascension and -2.00 arcmin in declination);

Distance of HR204 from the Sun and relative movement

HR204 is distant 580.07 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

177.94 pc
580.07 ly
-8 km/s
0.015 arcsec/year
-0.012 arcsec/year

Spectral properties of HR204

HR204 belongs to spectral class A2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR204 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR204. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR204