υ Librae (upsilon Librae)

Altitude: -45.1° Azimuth: 280.9° Direction: West

υ Librae is a double giant star in the constellation of Libra.

υ Librae visual magnitude is 3.58. Because of its moderate brightness, υ 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 υ Librae:

Color of υ Librae ⬤

Magnitude of υ Librae 3.58

Class Giant

VISIBILITY RIGHT NOW

υ Librae (upsilon Librae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -45.1°
Azimuth: 280.9°
Direction: West

Celestial coordinates and finder chart of υ Librae

υ Librae is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of υ Librae are provided in the following table:

Right Ascension J2000 15h 37m 01s

Declination J2000 -28° 08’ 06”

Galactic Longitude 341.89°

Galactic Latitude 21.94°

Constellation Libra

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

Finder chart υ Librae (upsilon Librae) star

Simplified finder chart for υ Librae (upsilon Librae).

Visibility of υ 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 υ Librae (upsilon 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: 118.1° RISE 7:07

Max altitude: 10.4° TRANSIT 10:17

Azimuth: 241.9° SET 13:27

Digitized Sky Survey image of υ Librae

The image below is a photograph of υ 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 υ Librae is -0.009 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

DSS2 image of υ Librae. The red arrow shows the motion of υ Librae during the next 100000 years (-15.00 arcmin in Right Ascension and 5.00 arcmin in declination);

Distance of υ Librae from the Sun and relative movement

υ Librae is distant 194.51 light years from the Sun and it is moving towards the Sun at the speed of 25 kilometers per second.

Distance (parsec) 59.67 pc

Distance (light year) 194.51 ly

Heliocentric radial velocity -25 km/s

Proper Motion RA -0.009 arcsec/year

Proper Motion Dec 0.003 arcsec/year

Spectral properties of υ Librae

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

Absolute magnitude -0.30

Spectral Type K3III

Color Index (B-V) 1.38

Temperature of υ Librae 3983K

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

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

υ Librae star system properties

υ 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 υ Librae double sysyem:

Main star magnitude 3.58

Secondary star magnitude 10.58

Magnitude difference 7

Separation 3.5 arcsec

Alternative designations of υ Librae

Bayer designation υ Librae
(upsilon Librae)

Flamsteed designation 39 Librae

Henry Draper Catalogue HD139063

SAO Catalogue SAO183619

Hipparcos Catalogue HIP76470

Durchmusterung Catalogue CD-2710464

FK5 Catalogue 579

Aitken Double Star Catalogue ADS9705

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