Sigma Librae

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Star
σ Librae
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Libra
Right ascension 15 h 04 m 4.22 s
declination -25 ° 16 ′ 55.2 ″
Apparent brightness 3.21 (3.2 to 3.46) mag
Typing
B − V color index (1.70) 
U − B color index (1.95) 
R − I index (1.27) 
Spectral class M3.5 IIIa
Variable star type SRB 
Astrometry
Radial velocity (−3.9 ± 0.7) km / s
parallax (7.92 ± 0.79)  mas
distance (410 ± 20)  ly
(126)  pc
Visual absolute brightness M vis (−1.5) mag
Proper movement 
Rec. Share: (-75.91 ± 1.33)  mas / a
Dec. portion: (−38.54 ± 1.13)  mas / a
Physical Properties
Dimensions (2.2 ± 0.5)  M ☉
radius (108)  R ☉
Luminosity

(1480)  L ☉

Effective temperature (3600)  K
Metallicity [Fe / H] (0.00)
Other names
and catalog entries
Bayer name σ Librae
Flamsteed name 20 Librae
Cordoba Survey CD −24 ° 11834
Bright Star Catalog HR 5603 [1]
Henry Draper Catalog HD 133216 [2]
Gliese catalog FY 9508 [3]
Hipparcos catalog HIP 73714 [4]
SAO catalog SAO 183139 [5]
Tycho catalog TYC 6752-1455-1 [6]
2MASS catalog 2MASS J15040422-2516549 [7]
Other names Brachium, FK5  556

σ Librae ( Sigma Librae , short σ Lib ) is a red giant on the AGB development path . It has an apparent magnitude of 3.2 mag, is about 400 light years away, and is located in the constellation Libra .

The star bears the historical proper names Brachium , Cornu , Zubenalgubi . He originally carried the Bayer designation γ Scorpii (Gamma Scorpii).

Individual evidence

  1. ↑ a b c d e f g h sig Lib. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on August 27, 2018 .
  2. ↑ a b c sig Lib. In: VSX. AAVSO, accessed August 27, 2018 .
  3. ↑ C. Yeşilyaprak, Z. Aslan: Period-luminosity relation for M-type semiregular variables from Hipparcos parallaxes . In: Monthly Notices of the Royal Astronomical Society . 355, No. 2, December 2004, pp. 601-607. bibcode : 2004MNRAS.355..601Y . doi : 10.1111 / j.1365-2966.2004.08344.x .
  4. ↑ a b T Tsuji: Cool luminous stars: The hybrid nature of their infrared spectra . In: Astronomy & Astrophysics . 489, No. 3, 2008, p. 1271. arxiv : 0807.4387 . bibcode : 2008A & A ... 489.1271T . doi : 10.1051 / 0004-6361: 200809869 .
  5. ↑ a b P Cruzalèbes, A Jorissen, Y Rabbia, S Sacuto, A Chiavassa, E Pasquato, B Plez, K Eriksson, A Spang, O Chesneau: Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI / AMBER . In: Monthly Notices of the Royal Astronomical Society . 434, 2013, p. 437. arxiv : 1306.3288 . bibcode : 2013MNRAS.434..437C . doi : 10.1093 / mnras / stt1037 .
  6. ↑ a b p Dehaes, E. Bauwens, L. Decin, K. Eriksson, G. Raskin, B. Butler, CD Dowell, B. Ali, JADL Blommaert: Structure of the outer layers of cool stars standard . In: Astronomy & Astrophysics . 533, September 2011, p. A107. arxiv : 0905.1240 . bibcode : 2011A & A ... 533A.107D . doi : 10.1051 / 0004-6361 / 200912442 .