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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Libra » 

ζ4 Librae (zeta4 Librae)

ζ4 Librae is a variable and double main-sequence star in the constellation of Libra.

ζ4 Librae visual magnitude is 5.5. Because of its reltive faintness, ζ4 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 ζ4 Librae:

ζ4 Librae (zeta4 Librae) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 12°.

Celestial coordinates and finder chart of ζ4 Librae

ζ4 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 ζ4 Librae are provided in the following table:

15h 32m 55s
-16° 51’ 10”

The simplified sky map below shows the position of ζ4 Librae in the sky:

Finder chart ζ4 Librae (zeta4 Librae) star
Simplified finder chart for ζ4 Librae (zeta4 Librae).

Visibility of ζ4 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 ζ4 Librae (zeta4 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: 106.9°
Max altitude: 21.7°
Azimuth: 253.1°
ζ4 Librae (zeta4 Librae) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of ζ4 Librae

The image below is a photograph of ζ4 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 ζ4 Librae is -0.011 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ζ4 Librae (zeta4 Librae) star
DSS2 image of ζ4 Librae. The red arrow shows the motion of ζ4 Librae during the next 10000 years (-1.83 arcmin in Right Ascension and -2.33 arcmin in declination);

Distance of ζ4 Librae from the Sun and relative movement

ζ4 Librae is distant 768.87 light years from the Sun and it is moving far from the Sun at the speed of 9 kilometers per second.

235.85 pc
768.87 ly
9 km/s
-0.011 arcsec/year
-0.014 arcsec/year

Spectral properties of ζ4 Librae

ζ4 Librae belongs to spectral class B2 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where ζ4 Librae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of ζ4 Librae. Attribution: Richard Powell / CC BY-SA

ζ4 Librae star system properties

ζ4 Librae 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 ζ4 Librae double sysyem:

0 arcsec

Alternative designations of ζ4 Librae

ζ4 Librae
(zeta4 Librae)