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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: 5:51  
clear_day Transit: 12:57  
SunsetSet: 20:04
sunny DaytimeWhat's Visible Now?
All Constellations » Boötes » 


Altitude: 10.9°   Azimuth: 63.2°   Direction: East-North-East

HR5640 is a double giant star in the constellation of Boötes.

HR5640 visual magnitude is 5.81. Because of its reltive faintness, HR5640 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR5640 is -0.008 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR5640 star
DSS2 image of HR5640. The red arrow shows the motion of HR5640 during the next 100000 years (-13.33 arcmin in Right Ascension and -1.67 arcmin in declination);

Key facts about HR5640


HR5640 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 10.9°
Azimuth: 63.2°
Direction: East-North-East

Celestial coordinates and finder chart of HR5640

HR5640 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 HR5640 are provided in the following table:

15h 08m 35s
+25° 06’ 30”

The simplified sky map below shows the position of HR5640 in the sky:

Finder chart HR5640 star
Simplified finder chart for HR5640.

Visibility of HR5640 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 HR5640 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: 64.9°
Max altitude: 63.6°
Azimuth: 295.1°

Distance of HR5640 from the Sun and relative movement

HR5640 is distant 510.17 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

156.49 pc
510.17 ly
-16 km/s
-0.008 arcsec/year
-0.001 arcsec/year

Spectral properties of HR5640

HR5640 belongs to spectral class K1 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR5640 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR5640. Attribution: Richard Powell / CC BY-SA

HR5640 star system properties

HR5640 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR5640 double sysyem:

57.5 arcsec

Alternative designations of HR5640