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public LocationGreenwich, UK
Sunrise: 5:00 
Transit: 13:04 
Sunset: 21:07
sunny   (Daytime)   What's Visible Now?
All Constellations » Perseus » 


Above the horizon.  Circumpolar today
Alt: 76.78°   Az: 296.98°   Direction: West-North-West

HR540 is a star of spectral class A5 in the constellation of Perseus.

HR540 visual magnitude is 6.45. Because of its faintness, HR540 is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

HR540 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere.

Image of HR540 star
DSS2 image of HR540. The red arrow shows the motion of HR540 during the next 10000 years (8.17 arcmin in Right Ascension and 0.17 arcmin in declination);

Celestial Coordinates


01h 55m 26s
+55° 43’ 04”
01h 24m 48s
03h 20m 15s


01h 53m 48s
+55° 35’ 53”

Galactic Coordinates


Finder Chart

Finder chart HR540 star
Simplified finder chart for HR540.

Magnitude, Color, Spectral Class



The red dot in the diagram below shows where HR540 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR540. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

HR540 is distant 239.53 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

73.48 pc
239.53 ly
8 km/s
0.049 arcsec/y
0.001 "/y

Alternative Designations


Visibility from Your Location

HR540 is circumpolar and transits at 06:21 UTC (altitude: 85.8°)