Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Libra
Right ascension
15h 04m 04.21608s[1]
Declination
–25° 16′ 55.0606″[1]
Apparent magnitude (V)
3.20 - 3.46[2]
Characteristics
Spectral type
M2.5III[3]
U−B color index
+1.94[4]
B−V color index
+1.70[4]
Variable type
SRb[2]
Astrometry
Radial velocity (Rv)
–4.2[5] km/s
Proper motion (μ)
RA: –71.16[1] mas/yr Dec.: −43.34[1] mas/yr
Parallax (π)
11.31 ± 0.25 mas[1]
Distance
288 ± 6 ly (88 ± 2 pc)
Absolute magnitude (MV)
–1.5[6]
Details
Mass
2.2[7]M☉
Radius
108[8]R☉
Luminosity
1,820[7]L☉
Surface gravity (log g)
0.9 ± 0.3[9] cgs
Temperature
3,596[7] K
Metallicity [Fe/H]
0.00[9] dex
Other designations
Brachium, 20 Librae, CD–24 11834, FK5 556, HD 133216, HIP 73714, HR 5603, SAO 183139.,[10] WDS 15041-2517[11]
Database references
SIMBAD
data
Sigma Librae (σ Librae, abbreviated Sigma Lib, σ Lib) is a binary star[11] in the constellation of Libra. The apparent visual magnitude is +3.29,[4] making it visible to the naked eye. Based upon parallax measurements, this system is at a distance of roughly 288 light-years (88 parsecs) from the Sun, with a 2% margin of error.[1] At that distance, the visual magnitude is diminished by 0.20 ± 0.17 from extinction caused by intervening gas and dust.[9]
The two components are designated Sigma Librae A (officially named Brachium/ˈbreɪkiəm/,[12] the traditional name for the system)[13] and B.
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^"brachium". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^"Naming Stars". IAU.org. Retrieved 16 December 2017.
SigmaLibrae (σ Librae, abbreviated Sigma Lib, σ Lib) is a binary star in the constellation of Libra. The apparent visual magnitude is +3.29, making it...
refer to: The arm or the upper arm The traditional name of the star SigmaLibrae Brachium of inferior colliculus, part of the brain Brachium of superior...
Suspected variable star 3.21 3.18 Gamma Cephei Binary star system 3.21 3.20 SigmaLibrae Star 3.21 G Scorpii Star 3.21 Zeta Cygni Binary star system 3.22 3.20...
Delphinus and Pegasus Bufo /ˈbjuːfoʊ/ Bufonis Toad 1754 John Hill 58 Hydrae, SigmaLibrae tail of Hydra Cancer Minor /ˈkænsərˈmaɪnər/ Cancri Minoris Lesser Crab...
southwestern part of Libra. The system is southwest of Alpha Librae and northwest of SigmaLibrae. In the early 1990s, the European Hipparcos mission measured...
later reassigned from Scorpius to Libra and given the new names Sigma and Upsilon Librae.: p. 196 (To add to the confusion, the star now known as Omicron...
Retinue 92 Leonis 虎賁 Hǔ Bēn Emperor's Bodyguard 72 Leonis 日 Rì Sun Kappa Librae Libra A single-star asterism in the Room mansion 騎陣將軍 Qí Zhèn Jiāng Jūn...
mass From : R = L 4 π σ T e 4 {\displaystyle R={\sqrt {\frac {L}{4\pi \sigma {T_{e}}^{4}}}}} , where L {\displaystyle L} is the luminosity, R {\displaystyle...
boundary between stellar kinematic groups and very wide binaries . II. α Librae + KU Librae: a common proper motion system in Castor separated by 1.0 pc". Astronomy...