Xi Lupi

The Bayer designation ξ Lupi (Xi Lupi) is shared by two star systems in the constellation Lupus:

ξ¹ Lupi (HD 142629)
ξ² Lupi (HD 142630)

Listed in the Washington Double Star Catalog as WDS J15569-3358, this double star most likely forms a wide binary star system.[1] As of epoch 2004.38, the pair had an angular separation of 10.254±0.016 arc seconds along a position angle of 49.21°±0.02°. The difference in visual magnitude between the two stars is 0.515±0.003.[2]

References

Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
Sinachopoulos, D.; et al. (September 2007), "CCD astrometry and components instrumental magnitude difference of 432 Hipparcos wide visual double stars", Astronomy and Astrophysics, 472 (3): 1055−1057, Bibcode:2007A&A...472.1055S, doi:10.1051/0004-6361:20066290.

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[Eggleton2008-1] Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.

[Sinachopoulos2007-2] Sinachopoulos, D.; et al. (September 2007), "CCD astrometry and components instrumental magnitude difference of 432 Hipparcos wide visual double stars", Astronomy and Astrophysics, 472 (3): 1055−1057, Bibcode:2007A&A...472.1055S, doi:10.1051/0004-6361:20066290.