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]
| 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 |
| Distance | 440 ± 30 ly (140 ± 10 pc) |
| Other designations | |
| π Lupi A: HD 133242, HR 5605 | |
| π Lupi B: HD 133243, HR 5606 | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
References
- 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
- 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
- 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
- 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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