Zeta Librae

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

Location of the ζ Librae pair (circled)

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

1. Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K.
2. Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
3. Hoffleit, D.; Jaschek, C. (1982). "The Bright Star Catalogue. Fourth revised edition. (Containing data compiled through 1979)". The Bright Star Catalogue. Fourth Revised Edition. (Containing Data Compiled Through 1979). Bibcode:1982bsc..book.....H.