Brachium - σ Librae (sigma Librae)
Brachium, also designated as σ Librae (sigma Librae), is a variable giant star in the constellation of Libra.
Brachium visual magnitude is 3.29. Because of its moderate brightness, Brachium 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 Brachium:
Celestial coordinates and finder chart of Brachium
Brachium is situated south of the celestial equator, as such, it is more easily visible from the southern emisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Brachium are provided in the following table:
The simplified sky map below shows the position of Brachium in the sky:
Visibility of Brachium from your location
Digitized Sky Survey image of Brachium
The image below is a photograph of Brachium 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 Brachium is -0.073 arcsec per year in Right Ascension and -0.043 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of Brachium from the Sun and relative movement
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.
Spectral properties of Brachium
Brachium belongs to spectral class M3 and has a luminosity class of III corresponding to a giant star.
The red dot in the diagram below shows where Brachium is situated in the Hertzsprung–Russell diagram.