Astronomy:X2 Centauri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 12h 25m 21.73454s[2] |
| Declination | −35° 11′ 11.0985″[2] |
| Apparent magnitude (V) | 5.71[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | B9 IV/V[4] |
| B−V color index | −0.06[5] |
| Astrometry | |
| Radial velocity (Rv) | −11.3[6] km/s |
| Proper motion (μ) | RA: −41,277[2][2] mas/yr Dec.: −6.379[2] mas/yr |
| Parallax (π) | 7.1919 ± 0.0668[2] mas |
| Distance | 454 ± 4 ly (139 ± 1 pc) |
| Absolute magnitude (MV) | 0.07[1] |
| Details | |
| Mass | 3.1[7] M☉ |
| Radius | 2.8[7] R☉ |
| Luminosity | 141[7] L☉ |
| Surface gravity (log g) | 4.02[7] cgs |
| Temperature | 111,794[7] K |
| Rotation | 7.26 days[8] |
| Age | 258[2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
x2 Centauri is a blue-white star located in the constellation Centaurus. Its name is a Bayer designation; 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 454 light-years (139 pc), based on parallax measurements.
x2 Centauri's spectral type is B9IV/V, meaning it displays blended properties of a late B-type main sequence star and a subgiant. It is an estimated 258 million years old,[2] and is spinning with a rotation period of 7.26 days days.[8] This star has 3.1 times the mass of the Sun and 2.8 times the Sun's radius.[7] It is radiating 141[7] times the luminosity of the Sun from its photosphere at an effective temperature of 111,794 K.[7]
The star x1 Centauri, which lies at an angular separation of 0.4′ 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.[10]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Høg, E. 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.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 8.0 8.1 Oelkers, Ryan J. et al. (2018). "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey". The Astronomical Journal 155 (1): 39. doi:10.3847/1538-3881/aa9bf4. Bibcode: 2018AJ....155...39O.
- ↑ "* 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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