X2 Centauri

For other stars with this Bayer designation, see x Centauri.

x² Centauri

Observation data Epoch J2000        Equinox J2000
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] mas/yr [2] Dec.: −6.379 mas/yr [2]
Parallax (π)	7.1919±0.0668  mas [2]
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
x2 Cen, CD−34°8146, GC 16938, HD 108114, HIP 60610, HR 4724, SAO 203450 [9]
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. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
3. 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.
4. 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.
5. 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.
6. 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. Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 .
8. 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. arXiv: 1711.03608 . Bibcode:2018AJ....155...39O. doi: 10.3847/1538-3881/aa9bf4 .
9. "* x2 Cen". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 15 January 2016.
10. "* x1 Cen". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 16 January 2017.