Zuben-el-dschenubi

Database links to α Librae (Zuben-el-Dschenubi)

Double star α Librae (Zuben-el-Dschenubi)
Observation dates equinox :  J2000.0 , epoch : J2000.0
AladinLite
Constellation	Libra
Apparent brightness	2.75 likes
Astrometry
parallax	43.03 ± 0.19 42.79 ± 0.20 mas
distance	76 ly (23 pc )
Absolute visual brightness M vis	+0.92 mag
Absolute bolometric magnitude M bol	+0.74 mag
Individual data
Names	A / α 2 ; B / α 1
Observation data:
Right ascension	A / α 2	14 h 50 m 52.7 s
	B / α 1	14 h 50 m 41,175 s
declination	A / α 2	−16 ° 02 ′ 30 ″
	B / α 1	−15 ° 59 ′ 50.029 ″
Apparent brightness	A / α 2	2.75 likes
	B / α 1	5.16 likes
Typing:
Spectral class	A / α 2	A3 V
	B / α 1	F3 V
B − V color index	A / α 2	+0.15
	B / α 1	+0.41
U − B color index	A / α 2	+0.09
	B / α 1	-0.04
Physical Properties:
Absolute vis. Brightness M vis	A / α 2	+0.92 mag
	B / α 1	+3.34 mag
Absolute bol. Brightness M bol	A / α 2	+0.74 mag
	B / α 1	+3.21 mag
radius	A / α 2	2.78 R ☉
	B / α 1	1.48 R ☉
Luminosity	A / α 2	36.3 L ☉
	B / α 1	3.9 L ☉
Effective temperature	A / α 2	8500 K
	B / α 1	6700 K
Other names and catalog entries
Bayer name α 2  Librae / α 1  Librae Flamsteed name 9 Librae / 8 Librae Bonn survey BD −15 ° 3966 BD −15 ° 3965 Bright Star Catalog HR 5531 HR 5530 Henry Draper Catalog HD 130841 HD 130819 SAO catalog SAO 158840 SAO 158836 Tycho catalog TYC 6155-1210-1 [1] TYC 6155-1209-1 [2] Hipparcos catalog HIP 72622 HIP 72603 WDS catalog WDS J14509-1603 Further designations: Zuben-el-dschenubi, SHJ 186   FK5 548, GJ 564.1 FK5 1387, GJ 563.4

Zuben-el-dschenubi or Zubenelgenubi (from Arabic .الزبانى الجنوبي az-zubānā al-ğanūbī 'the southern claw (of the scorpion)') is the name of the star Alpha Librae (α Librae) in the constellation Libra at a distance of 76 light years . Zuben-el-dschenubi is a spectroscopic binary star consisting of two white stars of the spectral type A3. It has an apparent magnitude of +2.75 mag and an absolute magnitude of 0.92 mag. Zuben-el-dschenubi has a companion star of apparent magnitude +5.15 ​​mag, whichcan be foundin binoculars due to its large angular distance of 231 "(= 3'51")(position angle 314 °). The companion's spectral type is F3 V, its absolute magnitude +3.34 mag.

As a star near the ecliptic, Zuben-el-dschenubi can be covered by the moon and planets . The last occultation of Zuben-el-dschenubi by a planet took place on October 25, 1947 by Venus, the next occultation of Zuben-el-dschenubi by a planet, which is very difficult to observe due to the low solar elongation , will be on November 10, 2052 Planet Mercury .

The IAU has the proper name on August 21, 2016 Zubenelgenubi defined as standardized proper names, but only for the main star α ² . The companion star α ¹ therefore does not have this proper name.

Individual evidence

1. ↑ ^{a b c d e} alf02 Lib. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed on March 13, 2020 . 
2. ↑ ^{a b c d e f} alf01 Lib. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed on March 13, 2020 . 
3. ↑ alf Lib. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on March 13, 2020 . 
4. ↑ NSI 6827th In: VSX. AAVSO , accessed March 13, 2020 . 
5. ↑ ^{a b} Alpha Librae. Jim Kaler, accessed March 13, 2020 . 
6. ↑ Bulletin of the IAU Working Group on Star Names, No. November 2, 2016. (PDF; 151 KiB) Retrieved November 15, 2016 (English).