Astronomy:X2 Centauri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 12h 25m 21.73494s[1] |
| Declination | −35° 11′ 11.0983″[1] |
| Apparent magnitude (V) | 5.71[2] |
| Characteristics | |
| Spectral type | B9 IV/V[3] |
| B−V color index | −0.06[4] |
| Astrometry | |
| Radial velocity (Rv) | −11.3[5] km/s |
| Proper motion (μ) | RA: −40.56[1] mas/yr Dec.: −6.29[1] mas/yr |
| Parallax (π) | 7.43 ± 0.33[1] mas |
| Distance | 440 ± 20 ly (135 ± 6 pc) |
| Absolute magnitude (MV) | 0.26[6] |
| Details | |
| Temperature | 11,500[6] K |
| Age | 135[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
x2 Centauri is a star located in the constellation Centaurus. It is also known by its designations HD 108114 and HR 4724. The apparent magnitude of the star is about 5.7, meaning it is only visible to the naked eye under excellent viewing conditions. Its distance is about 440 light-years (140 parsecs), based on its parallax measured by the Hipparcos astrometry satellite.[1]
x2 Centauri's spectral type is B9IV/V, meaning it is a late B-type main sequence star or subgiant. These types of stars are a few times more massive than the Sun, and have effective temperatures of about 10,000 to 30,000 K. x2 Centauri has a temperature of about 11,500 K.[7] The star x1 Centauri, which lies about 0.4′ away from x2 Centauri, may or may not form a physical binary star system with x2 Centauri, as the two have similar proper motions and distances.[9]
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. http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. Bibcode: 2000A&A...355L..27H.
- ↑ Houk, N. (1982). "Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0". Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode: 1982mcts.book.....H.
- ↑ Lake, R. (1965). "Photometric Magnitudes and Colours for Bright Southern Stars (Sixth List)". Monthly Notes of the Astron. Soc. Southern Africa 24: 41. Bibcode: 1965MNSSA..24...41L.
- ↑ Evans, D. S. (2006). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications 30: 57. Bibcode: 1967IAUS...30...57E.
- ↑ 6.0 6.1 Westin, T. N. G. (1985). "The local system of early type stars - Spatial extent and kinematics". Astronomy and Astrophysics Supplement Series 60 (99–134): 99. Bibcode: 1985A&AS...60...99W.
- ↑ 7.0 7.1 Grosbol, P. J. (1978). "Space velocities and ages of nearby early-type stars". Astronomy and Astrophysics Supplement Series 32: 409–421. Bibcode: 1978A&AS...32..409G.
- ↑ "* x2 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+x2+Cen.
- ↑ "* x1 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+x1+Cen.
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