Zeta Librae

Location of the ζ Librae pair (circled)

The Bayer designation ζ Librae, Latinised as Zeta Librae (abbreviated ζ Lib / Zeta Lib) is shared by several star systems in the constellation Libra. Sources differ about the Flamsteed and Bayer designations that should be applied to four stars:^[1][2]

• ζ¹ Librae (HR 5743), known as HD 137744 and 32 Librae
• ζ² Librae (GZ Librae), sometimes known as 33 Librae, or as HD 137949
• ζ³ Librae (HR 5750), known as HD 138137 and 34 Librae
• ζ⁴ Librae (HR 5764), known as HD 138485 and 35 Librae, often simply called ζ Librae

In light of the obvious confusion, the Bright Star Catalogue recommends the use of HR designations to unambiguously identify these four stars. ζ² Librae does not have an HR number although it is included in the Bright Star Catalogue Supplement.^[2][3]

References

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