Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

θ Librae (theta Librae)

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

θ Librae visual magnitude is 4.15. Because of its moderate brightness, θ Librae should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about θ Librae:

4.15
Giant
θ Librae (theta Librae) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 19°.

Celestial coordinates and finder chart of θ Librae

θ 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 θ Librae are provided in the following table:

15h 53m 49s
-16° 43’ 45”
353.54°
27.72°
Libra

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

Finder chart θ Librae (theta Librae) star
Simplified finder chart for θ Librae (theta Librae).

Visibility of θ Librae from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's θ Librae (theta Librae) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 106.7°
Max altitude: 21.8°
Azimuth: 253.3°
θ Librae (theta Librae) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of θ Librae

The image below is a photograph of θ 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 θ Librae is 0.099 arcsec per year in Right Ascension and 0.133 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of θ Librae (theta Librae) star
DSS2 image of θ Librae. The red arrow shows the motion of θ Librae during the next 1000 years (1.65 arcmin in Right Ascension and 2.22 arcmin in declination);

Distance of θ Librae from the Sun and relative movement

θ Librae is distant 162.84 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

49.95 pc
162.84 ly
3 km/s
0.099 arcsec/year
0.133 arcsec/year

Spectral properties of θ Librae

θ Librae belongs to spectral class G8 and has a luminosity class of III corresponding to a giant star.

0.66
G8III
4695K

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

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

Alternative designations of θ Librae

θ Librae
(theta Librae)
SAO159563
SAO159563