Beta Librae (β Librae/β Lib), also known under the traditional name of Zuben Eschamali is a star located in the Constellation of the Balance.

Physical characteristics

β Librae is a star of the principal Séquence, of color blue-white, heat (approximately 9.300 K), 180 times more luminous than the Sun for hardly 5 times its diameter. It rotates quickly, with nearly 200 km/s to the equator.

β Librae was sometimes classified “variable” because she was formerly considered more brilliant than Antarès, a star first magnitude (but itself variable, its Magnitude connects variable between 1,1 and 2,0) in the constellation of the Scorpion near. She in any case does not present any apparent sign of variability to modern times.

Stellar environment

Being a star of the very hot principal sequence, β Librae has a very simple spectrum. As it is sufficiently distant from us (160 light-years), it is ideal for the observation of the interstellar Milieu.

Name

The name “Zuben Eschamali” comes from an Arab sentence meaning “the northern grip of the Scorpion” (the southern grip being Alpha Librae, or Zuben Elgenubi, “the southern grip of the Scorpion”). This name highlights that the stars of the Balance were regarded by the Astronome S of Antiquity as belonging to the grips of the Scorpion, the constellation immediately in the east. It is only tardily, and with an aim of cutting out the area of the ecliptic in 12 sectors of close size that the constellation of the Balance was introduced, cutting down the grips by the constellation of the Scorpion of the major part their length. The traditional name of these stars however reflects their old membership of the constellation of the Scorpion.

β Librae is also named Kiffa Borealis, a version Latin ized of an Arab sentence meaning “the northern plate” (Balance).

Designations

• Proper names: Zuben Eschamali, Zubeneschamali, Zuben Elschemali, Zubenesch, Zubenelg, Kiffa Borealis
• Designation of Bayer: β Librae
• Designation of Flamsteed: 27 Librae
• Harvard Revised Photometry: HR 5685
• Henry Catalog To drape: HD 135742
• Catalog SAO: SAO 140430
• Bonner Durchmusterung : Data base -8°3935
• Fifth Fundamental Catalogs: FK5 564
• New Catalogs Suspected Variable Stars off: NSV 07009
• Catalog Hipparcos: 74785

External bond

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