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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: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
wb_twilight Nautical TwilightWhat's Visible Now?
All Constellations » Perseus » 


Altitude: 20.1°   Azimuth: 342.0°   Direction: North-North-West

HR540 is a star in the constellation of Perseus.

HR540 visual magnitude is 6.45. Because of its reltive faintness, HR540 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 HR540:


HR540 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 20.1°
Azimuth: 342.0°
Direction: North-North-West

Celestial coordinates and finder chart of HR540

HR540 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 HR540 are provided in the following table:

01h 53m 48s
+55° 35’ 53”

The simplified sky map below shows the position of HR540 in the sky:

Finder chart HR540 star
Simplified finder chart for HR540.

Visibility of HR540 from your location

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

HR540 is circumpolar and transits at 20:36 UTC (altitude: 85.9°)

Digitized Sky Survey image of HR540

The image below is a photograph of HR540 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 HR540 is 0.049 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 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);

Distance of HR540 from the Sun and relative movement

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/year
0.001 arcsec/year

Spectral properties of HR540

HR540 belongs to spectral class A5


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

Alternative designations of HR540