ζ4 Librae (zeta4 Librae)

Above the horizon. Rise: 20:33 | Tran: 1:06 | Set: 5:34

Alt: 14.52° Az: 143.95° Direction: South-East

ζ4 Librae is a variable and double main-sequence star of spectral class B2 in the constellation of Libra.

ζ4 Librae visual magnitude is 5.5. Because of its faintness, ζ4 Librae is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

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);

Celestial Coordinates

Apparent

Right Ascension 15h 34m 21s

Declination -16° 56’ 13”

Hour Angle 21h 33m 48s

Sidereal Time 13h 08m 09s

J2000

Right Ascension 15h 32m 55s

Declination -16° 51’ 10”

Galactic Coordinates

Galactic Longitude 349.32°

Galactic Latitude 31.11°

Finder Chart

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Finder chart for ζ4 Librae (zeta4 Librae).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.5

Class Main-sequence

Absolute magnitude -1.36

Spectral Type B2V

Color Index (B-V) -0.14

Temperature 12293K

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

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

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:

Main star magnitude 5.5

Secondary star magnitude 7.5

Magnitude difference 2

Separation 0 arcsec

Distance, Radial Speed, Proper Motion

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.

Distance (parsec) 235.85

Distance (light year) 768.87

Radial Speed 9 km/s

Proper Motion RA -0.011 arcsec/y

Proper Motion Dec -0.014"/y

Alternative Designations

Bayer designation ζ4 Librae
(zeta4 Librae)

Flamsteed designation 35 Librae

Henry Draper Catalogue HD138485

SAO Catalogue SAO159335

Hipparcos Catalogue HIP76126

Durchmusterung Catalogue BD-16 4110

General Catalogue of Variable Stars 7126

Visibility from Your Location

Today's ζ4 Librae (zeta4 Librae) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 106.9° RISE 20:33

Max altitude: 21.6° TRANSIT 1:06

Azimuth: 253.1° SET 5:34

Set Location

Other stars in Libra