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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: 7:01  
clear_day Transit: 12:12  
SunsetSet: 17:24
sunny DaytimeWhat's Visible Now?
All Constellations » Cassiopeia » 


Altitude: 53.3°   Azimuth: 52.3°   Direction: North-East

HR181 is a giant star in the constellation of Cassiopeia.

HR181 visual magnitude is 6.17. Because of its reltive faintness, HR181 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The proper motion of HR181 is 0.036 arcsec per year in Right Ascension and -0.007 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR181 star
DSS2 image of HR181. The red arrow shows the motion of HR181 during the next 10000 years (6.00 arcmin in Right Ascension and -1.17 arcmin in declination);

Key facts about HR181


HR181 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 53.3°
Azimuth: 52.3°
Direction: North-East

Celestial coordinates and finder chart of HR181

HR181 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 HR181 are provided in the following table:

00h 42m 31s
+58° 45’ 11”

The simplified sky map below shows the position of HR181 in the sky:

Finder chart HR181 star
Simplified finder chart for HR181.

Visibility of HR181 from your location

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

HR181 is circumpolar and transits at 14:34 UTC (altitude: 82.7°)

Distance of HR181 from the Sun and relative movement

HR181 is distant 1,015.58 light years from the Sun and it is moving towards the Sun at the speed of 3 kilometers per second.

311.53 pc
1,015.58 ly
-3 km/s
0.036 arcsec/year
-0.007 arcsec/year

Spectral properties of HR181

HR181 belongs to spectral class B9 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR181 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR181. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR181