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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
SunriseRise: 6:42  
clear_day Transit: 12:10  
SunsetSet: 17:40
sleep NighttimeWhat's Visible Now?
All Constellations » Libra » 

42 Librae

Altitude: -18.2°   Azimuth: 105.6°   Direction: East-South-East

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

42 Librae visual magnitude is 4.96. Because of its moderate brightness, 42 Librae should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of 42 Librae is -0.013 arcsec per year in Right Ascension and -0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 42 Librae star
DSS2 image of 42 Librae. The red arrow shows the motion of 42 Librae during the next 10000 years (-2.17 arcmin in Right Ascension and -2.00 arcmin in declination);

Key facts about 42 Librae


42 Librae is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -18.2°
Azimuth: 105.6°
Direction: East-South-East

Celestial coordinates and finder chart of 42 Librae

42 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 42 Librae are provided in the following table:

15h 40m 16s
-23° 49’ 05”

The simplified sky map below shows the position of 42 Librae in the sky:

Finder chart 42 Librae star
Simplified finder chart for 42 Librae.

Visibility of 42 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 42 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: 113.8°
Max altitude: 14.7°
Azimuth: 246.2°

Distance of 42 Librae from the Sun and relative movement

42 Librae is distant 381.29 light years from the Sun and it is moving towards the Sun at the speed of 22 kilometers per second.

116.96 pc
381.29 ly
-22 km/s
-0.013 arcsec/year
-0.012 arcsec/year

Spectral properties of 42 Librae

42 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 42 Librae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 42 Librae. Attribution: Richard Powell / CC BY-SA

Alternative designations of 42 Librae