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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: 7:51  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
wb_twilight Astronomical TwilightWhat's Visible Now?
All Constellations » Libra » 

18 Librae

Altitude: 11.9°   Azimuth: 125.6°   Direction: South-East

18 Librae is a multiple giant star in the constellation of Libra.

18 Librae visual magnitude is 5.87. Because of its reltive faintness, 18 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 18 Librae:


18 Librae is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 11.9°
Azimuth: 125.6°
Direction: South-East

Celestial coordinates and finder chart of 18 Librae

18 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 18 Librae are provided in the following table:

14h 58m 53s
-11° 08’ 39”

The simplified sky map below shows the position of 18 Librae in the sky:

Finder chart 18 Librae star
Simplified finder chart for 18 Librae.

Visibility of 18 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 18 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: 101.1°
Max altitude: 27.4°
Azimuth: 258.9°

Digitized Sky Survey image of 18 Librae

The image below is a photograph of 18 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 18 Librae is -0.101 arcsec per year in Right Ascension and -0.061 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 18 Librae star
DSS2 image of 18 Librae. The red arrow shows the motion of 18 Librae during the next 1000 years (-1.68 arcmin in Right Ascension and -1.02 arcmin in declination);

Distance of 18 Librae from the Sun and relative movement

18 Librae is distant 315.89 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

96.90 pc
315.89 ly
-12 km/s
-0.101 arcsec/year
-0.061 arcsec/year

Spectral properties of 18 Librae

18 Librae belongs to spectral class K3 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 18 Librae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 18 Librae. Attribution: Richard Powell / CC BY-SA

18 Librae star system properties

18 Librae 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 18 Librae double sysyem:

19.7 arcsec

Alternative designations of 18 Librae