We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Your support helps us pay the server bills » Donate
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:59  
clear_day Transit: 12:12  
SunsetSet: 17:25
sunny DaytimeWhat's Visible Now?
All Constellations » Vulpecula » 


Altitude: 8.8°   Azimuth: 300.1°   Direction: West-North-West

HR7540 is a hypergiant star in the constellation of Vulpecula.

HR7540 visual magnitude is 5.95. Because of its reltive faintness, HR7540 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 HR7540 is 0.082 arcsec per year in Right Ascension and -0.026 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7540 star
DSS2 image of HR7540. The red arrow shows the motion of HR7540 during the next 10000 years (13.67 arcmin in Right Ascension and -4.33 arcmin in declination);

Key facts about HR7540


HR7540 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 8.8°
Azimuth: 300.1°
Direction: West-North-West

Celestial coordinates and finder chart of HR7540

HR7540 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 HR7540 are provided in the following table:

19h 47m 48s
+25° 23’ 02”

The simplified sky map below shows the position of HR7540 in the sky:

Finder chart HR7540 star
Simplified finder chart for HR7540.

Visibility of HR7540 from your location

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

Today's HR7540 rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 64.6°
Max altitude: 63.9°
Azimuth: 295.4°

Distance of HR7540 from the Sun and relative movement

HR7540 is distant 399.51 light years from the Sun and it is moving towards the Sun at the speed of 18 kilometers per second.

122.55 pc
399.51 ly
-18 km/s
0.082 arcsec/year
-0.026 arcsec/year

Spectral properties of HR7540

HR7540 belongs to spectral class K0 and has a luminosity class of II corresponding to a hypergiant star.


The red dot in the diagram below shows where HR7540 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7540. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7540