Delta Librae

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δ Librae
Observation data
Epoch J2000      Equinox J2000
Constellation Libra
Right ascension 15h 00m 58.4s
Declination −08° 31′ 08.0″
Apparent magnitude (V) 4.43
Spectral type B9.5V
Variable type Eclipsing binary
Distance 300 ly
Other designations
Zuben Elakribi, 19 Librae, HIP 73473

Delta Librae (δ Librae, δ Lib) is a variable star in the constellation Libra. It has the traditional name Zuben Elakribi, a variant of the traditional name of Gamma Librae.[1] With μ Vir it forms one of the Akkadian lunar mansions Mulu-izi[2] (meaning "Man-of-fire"[3]).

δ Lib is approximately 300 light years from the Earth and belongs to the spectral class B9.5V. It is an eclipsing binary star, with a period of 2.3272 days. Its apparent magnitude varies from 4.43m to 5.81m.

Along with λ Tau, it was one of the first stars on which rotational line broadening[4] was observed, by Frank Schlesinger in 1911.


  1. ^ Bečvář, A., Atlas Coeli II Atlas Coeli II- Catalog, Ceskoslovenské Akademie Ved, Praha,1959.
  2. ^ Allen, R. H., (1963). Star Names: Their Lore and Meaning (rep. ed.). New York, NY: Dover Publications Inc.  pp. 277, 473.
  3. ^ Brown Jr., R., (1891). "Remarks on the Euphratean Astronomical Names of the Signs of the Zodiac", Proceedings of the Society of Biblical Archaeology, vo. 13, p. 194.
  4. ^ Schlesinger, F., (1909). "Rotation of Stars about their Axes", Monthly Notices of the Royal Astronomical Society, Vol. 71, p.719.