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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: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
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All Constellations » Libra » 

Zubenelgenubi - α2 Librae (alpha2 Librae)

Altitude: -15.9°   Azimuth: 264.0°   Direction: West

Zubenelgenubi, also designated as α2 Librae (alpha2 Librae), is a variable and multiple sub-giant star in the constellation of Libra.

Zubenelgenubi visual magnitude is 2.75. Thanks to its high brightness, Zubenelgenubi is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Zubenelgenubi:


Zubenelgenubi - α2 Librae (alpha2 Librae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -15.9°
Azimuth: 264.0°
Direction: West

Celestial coordinates and finder chart of Zubenelgenubi

Zubenelgenubi is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Zubenelgenubi are provided in the following table:

14h 50m 52s
-16° 02’ 30”

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

Finder chart Zubenelgenubi - α2 Librae (alpha2 Librae) star
Simplified finder chart for Zubenelgenubi - α2 Librae (alpha2 Librae).

Visibility of Zubenelgenubi 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 Zubenelgenubi - α2 Librae (alpha2 Librae) 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: 106.0°
Max altitude: 22.5°
Azimuth: 254.0°

Digitized Sky Survey image of Zubenelgenubi

The image below is a photograph of Zubenelgenubi 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 Zubenelgenubi is -0.106 arcsec per year in Right Ascension and -0.067 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Zubenelgenubi - α2 Librae (alpha2 Librae) star
DSS2 image of Zubenelgenubi. The red arrow shows the motion of Zubenelgenubi during the next 1000 years (-1.77 arcmin in Right Ascension and -1.12 arcmin in declination);

Distance of Zubenelgenubi from the Sun and relative movement

Zubenelgenubi is distant 77.16 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

23.67 pc
77.16 ly
-10 km/s
-0.106 arcsec/year
-0.067 arcsec/year

Spectral properties of Zubenelgenubi

Zubenelgenubi belongs to spectral class A3 and has a luminosity class of IV corresponding to a sub-giant star.


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

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

Zubenelgenubi star system properties

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

0 arcsec

Alternative designations of Zubenelgenubi

α2 Librae
(alpha2 Librae)
Gl 564.1