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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: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
sunny DaytimeWhat's Visible Now?
All Constellations » Lupus » 


Altitude: -16.0°   Azimuth: 214.9°   Direction: South-West

HR5781 is a variable and double sub-giant star in the constellation of Lupus.

HR5781 visual magnitude is 4.54. Because of its moderate brightness, HR5781 should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about HR5781:


HR5781 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -16.0°
Azimuth: 214.9°
Direction: South-West

Celestial coordinates and finder chart of HR5781

HR5781 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR5781 are provided in the following table:

15h 35m 53s
-44° 57’ 30”

The simplified sky map below shows the position of HR5781 in the sky:

Finder chart HR5781 star
Simplified finder chart for HR5781.

Visibility of HR5781 from your location

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

HR5781 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR5781

The image below is a photograph of HR5781 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 HR5781 is -0.025 arcsec per year in Right Ascension and -0.03 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR5781 star
DSS2 image of HR5781. The red arrow shows the motion of HR5781 during the next 10000 years (-4.17 arcmin in Right Ascension and -5.00 arcmin in declination);

Distance of HR5781 from the Sun and relative movement

HR5781 is distant 434.09 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

133.16 pc
434.09 ly
7 km/s
-0.025 arcsec/year
-0.03 arcsec/year

Spectral properties of HR5781

HR5781 belongs to spectral class B3 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR5781 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR5781. Attribution: Richard Powell / CC BY-SA

HR5781 star system properties

HR5781 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR5781 double sysyem:

2.4 arcsec

Alternative designations of HR5781