Pi Lupi

π Lupi (Latinised to Pi Lupi) is a multiple star system in the southern constellation Lupus. Two components form a wide binary pair with an orbital period of 517 years and a semimajor axis of 1.59″. At least one of the components is a spectroscopic binary. They belong to the Upper Centaurus Lupus component of the Sco–Cen Complex.[3]

π Lupi
Observation data
Epoch J2000      Equinox J2000
Constellation Lupus
Right ascension 15h 05m 07.08596s[1]
Declination −47° 03′ 04.4976″[1]
Apparent magnitude (V) 3.89[2]
Characteristics
Spectral type B5V + B5IV[3]
U−B color index −0.59[2]
B−V color index −0.14[2]
Astrometry
Radial velocity (Rv)+4.50[4] km/s
Proper motion (μ) RA: −22.98[1] mas/yr
Dec.: −22.81[1] mas/yr
Parallax (π)7.36 ± 0.55[1] mas
Distance440 ± 30 ly
(140 ± 10 pc)
Other designations
CD-46°9773, HIP 73807, SAO 225426
π Lupi A: HD 133242, HR 5605
π Lupi B: HD 133243, HR 5606
Database references
SIMBADdata
A
B

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357Vizier catalog entry
  2. Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N
  3. Nitschelm, C. (December 2004), Hilditch, R. W.; Hensberge, H.; Pavlovski, K. (eds.), "Discovery and confirmation of some double-lined spectroscopic binaries in the Sco-Cen Complex", Spectroscopically and Spatially Resolving the Components of the Close Binary Stars, Proceedings of the Workshop held 20–24 October 2003 in Dubrovnik, Croatia., ASP Conference Series, Astronomical Society of the Pacific, 318, pp. 291–293, Bibcode:2004ASPC..318..291N
  4. Kharchenko, N. V.; et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889–896, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776


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