Astronomy:Xi2 Lupi
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 56m 54.12100s[1] |
| Declination | −33° 57′ 51.3448″[1] |
| Apparent magnitude (V) | 5.55[2] |
| Characteristics | |
| Spectral type | B9 V[3] |
| B−V color index | +0.06[2] |
| Astrometry | |
| Radial velocity (Rv) | −12.20±1.78[4] km/s |
| Proper motion (μ) | RA: +23.56[1] mas/yr Dec.: −43.29[1] mas/yr |
| Parallax (π) | 21.71 ± 4.70[1] mas |
| Distance | approx. 150 ly (approx. 46 pc) |
| Details | |
| Mass | 2.38[5] M☉ |
| Luminosity | 10.6[6] L☉ |
| Surface gravity (log g) | 4.22±0.14[5] cgs |
| Temperature | 9,725±331[5] K |
| Rotational velocity (v sin i) | 184[5] km/s |
| Age | 381[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Xi2 Lupi (ξ2 Lup, ξ2 Lupi) is a member of a double star[8] with Xi1 Lupi in the southern constellation of Lupus. As of 2004, the pair had an angular separation of 10.254 arcseconds along a position angle of 49.21°.[9] Xi2 Lupi is visible to the naked eye with an apparent visual magnitude of 5.55.[2] Based upon an annual parallax shift of 21.71[1] mas as seen from Earth, it is located roughly 150 light-years from the Sun. It has a peculiar velocity of 14.3±1.9 km/s relative to its neighbors, and is probably (86% chance) a runaway star.[10]
This is a B-type main-sequence star with a stellar classification of B9 V.[3] It has an estimated 2.38[5] times the mass of the Sun and radiates 10.6[6] times the Sun's luminosity from its outer atmosphere at an effective temperature of 9,725 K.[5] Xi2 Lupi is about 381 million years old and is spinning relatively rapidly with a projected rotational velocity of 184 km/s.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 Høg, E. et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics 355: L27, doi:10.1888/0333750888/2862, Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 Levato, H. (January 1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics Supplement Series 19: 91–99, Bibcode: 1975A&AS...19...91L.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 6.0 6.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "ksi02 Lup". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ksi02+Lup.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1051/0004-6361:20066290, Bibcode: 2007A&A...472.1055S.
- ↑ Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
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