x1 Centauri

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x1 Centauri
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 12h 23m 35.42002s[1]
Declination −35° 24′ 45.6383″[1]
Apparent magnitude (V) 5.312[2]
Spectral type B8/9V[2]
B−V color index -0.08[3]
Radial velocity (Rv)-10.00[4] km/s
Proper motion (μ) RA: -41.17[1] mas/yr
Dec.: -7.44[1] mas/yr
Parallax (π)7.34 ± 0.26[1] mas
Distance440 ± 20 ly
(136 ± 5 pc)
Absolute magnitude (MV)-0.2[5]
Mass3[6] M
Radius3.6[7] R
Luminosity265[8] L
Temperature11300[6] K
Age0.151[6] Gyr
Other designations
x1 Cen, 113 G. Cen,[8] CD-34° 8117, HD 107832, HIP 60449, SAO 203420, HR 4712, GC 16892[2]
Database references

x1 Centauri is a star located in the constellation Centaurus. It is also known by its designations HD 107832 and HR 4712. The apparent magnitude of the star is about 5.3, 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]

x1 Centauri's spectral type is B8/9V, meaning it is a late B-type main sequence star. 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. x1 Centauri is just over 3 times more massive than the Sun[6] and has a temperature of about 11,300 K.[6] The star x2 Centauri, which lies about 0.4′ away from x1 Centauri, may or may not form a physical binary star system with x1 Centauri, as the two have similar proper motions and distances.[2][9]


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d "* x1 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 January 2016. 
  3. ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "Ubvrijkl Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J. 
  4. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  5. ^ Jaschek, C.; Gomez, A. E. (1998). "The absolute magnitude of the early type MK standards from HIPPARCOS parallaxes". Astronomy and Astrophysics. 330 (619–625). Bibcode:1998A&A...330..619J. 
  6. ^ a b c d e 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. 
  7. ^ Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367: 521–24. arXiv:astro-ph/0012289Freely accessible. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. 
  8. ^ a b de Vaucouleurs, A. (1957). "Spectral types and luminosities of B, A and F southern stars". Monthly Notices of the Royal Astronomical Society. 117: 449. Bibcode:1957MNRAS.117..449D. doi:10.1093/mnras/117.4.449. 
  9. ^ "* x2 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 January 2017.