Brachium - σ Librae (sigma Librae)

Below the horizon. Rise: 17:19 | Tran: 23:23 | Set: 5:32

Alt: -21.56° Az: 240.96° Direction: West-South-West

Brachium, also designated as σ Librae (sigma Librae), is a variable giant star of spectral class M3 in the constellation of Libra.

Brachium visual magnitude is 3.29. Because of its moderate brightness, Brachium is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Image of Brachium - σ Librae (sigma Librae) star

DSS2 image of Brachium. The red arrow shows the motion of Brachium during the next 10000 years (-12.17 arcmin in Right Ascension and -7.17 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 15h 05m 33s

Declination -25° 22’ 47”

Hour Angle 07h 43m 21s

Sidereal Time 22h 48m 55s

J2000

Right Ascension 15h 04m 04s

Declination -25° 16’ 54”

Galactic Coordinates

Galactic Longitude 337.22°

Galactic Latitude 28.62°

Finder Chart

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Finder chart for Brachium - σ Librae (sigma Librae).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 3.29

Class Giant

Absolute magnitude -1.47

Spectral Type M3III

Color Index (B-V) 1.7

Temperature 3516K

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

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

Distance, Radial Speed, Proper Motion

Brachium is distant 291.85 light years from the Sun and it is moving towards the Sun at the speed of 4 kilometers per second.

Distance (parsec) 89.53

Distance (light year) 291.85

Radial Speed -4 km/s

Proper Motion RA -0.073 arcsec/y

Proper Motion Dec -0.043"/y

Alternative Designations

Proper Name Brachium

Bayer designation σ Librae
(sigma Librae)

Flamsteed designation 20 Librae

Henry Draper Catalogue HD133216

SAO Catalogue SAO183139

Hipparcos Catalogue HIP73714

Durchmusterung Catalogue CD-2411834

FK5 Catalogue 556

General Catalogue of Variable Stars Sig Lib

Visibility from Your Location

Today's Brachium - σ Librae (sigma Librae) rise, transit and set times from Mayumba, Gabon are the following (all times relative to the local timezone Africa/Libreville):

Azimuth: 115.4° RISE 17:19

Max altitude: 68.1° TRANSIT 23:23

Azimuth: 244.6° SET 5:32

Name:	Mayumba, Gabon
Latitude:	3° 25' 55.1" S
Longitude:	10° 39' 19.4" E
Timezone:	Africa/Libreville

Set Location

Other stars in Libra