Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:52  
clear_day Transit: 12:55  
SunsetSet: 20:59 south
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Breakng! newly discovered Supernova 2023ixf in the Pinwheel Galaxy is the closest supernova observed in the latest decade. It can become bright enough to be visible by amateur astronomers. Check out information and detailed finder chart.
All Constellations » Libra » 

ζ1 Librae (zeta1 Librae)

ζ1 Librae is a giant star in the constellation of Libra.

ζ1 Librae visual magnitude is 5.64. Because of its reltive faintness, ζ1 Librae 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 ζ1 Librae:

ζ1 Librae (zeta1 Librae) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 19°.

Celestial coordinates and finder chart of ζ1 Librae

ζ1 Librae 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 ζ1 Librae are provided in the following table:

15h 28m 15s
-16° 42’ 59”

The simplified sky map below shows the position of ζ1 Librae in the sky:

Finder chart ζ1 Librae (zeta1 Librae) star
Simplified finder chart for ζ1 Librae (zeta1 Librae).

Visibility of ζ1 Librae 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 ζ1 Librae (zeta1 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: 106.7°
Max altitude: 21.8°
Azimuth: 253.3°
ζ1 Librae (zeta1 Librae) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of ζ1 Librae

The image below is a photograph of ζ1 Librae 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 ζ1 Librae is 0.017 arcsec per year in Right Ascension and -0.032 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ζ1 Librae (zeta1 Librae) star
DSS2 image of ζ1 Librae. The red arrow shows the motion of ζ1 Librae during the next 10000 years (2.83 arcmin in Right Ascension and -5.33 arcmin in declination);

Distance of ζ1 Librae from the Sun and relative movement

ζ1 Librae is distant 908.08 light years from the Sun and it is moving towards the Sun at the speed of 21 kilometers per second.

278.55 pc
908.08 ly
-21 km/s
0.017 arcsec/year
-0.032 arcsec/year

Spectral properties of ζ1 Librae

ζ1 Librae belongs to spectral class K5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where ζ1 Librae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of ζ1 Librae. Attribution: Richard Powell / CC BY-SA

Alternative designations of ζ1 Librae

ζ1 Librae
(zeta1 Librae)