Xi1 Centauri

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ξ1 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Centaurus
Right ascension 13h 03m 33.30528s[1]
Declination −49° 31′ 38.1518″[1]
Apparent magnitude (V) +4.83[2]
Spectral type A0 V[3]
U−B color index +0.014[2]
B−V color index +0.030[2]
Radial velocity (Rv) 0.00±3.70[4] km/s
Proper motion (μ) RA: −47.55[1] mas/yr
Dec.: −11.52[1] mas/yr
Parallax (π) 14.79 ± 0.27[1] mas
Distance 221 ± 4 ly
(68 ± 1 pc)
Mass 2.39 M
Radius 2.7[6] R
Luminosity 43.2[7] L
Surface gravity (log g) 4.11±0.14 cgs
Temperature 10,462±356 K
Rotational velocity (v sin i) 185[8] km/s
Age 125 Myr
Other designations
φ1 Cen, CD−48° 7887, HD 113314, HIP 63724, HR 4933, SAO 223870.[9]
Database references

Xi1 Centauri1 Cen, ξ1 Centauri) is a solitary[10] star in the southern constellation of Centaurus. It is visible to the naked eye with an apparent visual magnitude of +4.83.[2] With an annual parallax shift of 14.79 mas,[1] it is located around 221 light years from the Sun. At that distance, the apparent visual magnitude of the star is diminished by an interstellar extinction factor of 0.10[11] due to intervening dust. Just 17 arc seconds to the west of Xi1 Centauri lies the galaxy NGC 4945.[12]

This is an A-type main sequence star with a stellar classification of A0 V.[3] It is about 125[5] million years old with a relatively high rate of spin, having a projected rotational velocity of 185 km/s.[8] The star has an estimated 2.4[5] times the mass of the Sun and 2.7[6] times the Sun's radius. It is radiating 43[7] times the solar luminosity from its outer atmosphere at an effective temperature of 10,462 K.[5]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168. 
  3. ^ a b Bauwens, E. K. J.; et al. (2010), "Candidate Calibrators for the In-Orbit Spectrophotometric Calibration of the MIRI Medium Resolution Spectrograph Onboard the James Webb Space Telescope", in Deustua, Susana; Oliveira, Cristina, The 2010 STScI Calibration Workshop (PDF), Space Telescope Science Institute, retrieved 2016-01-10. 
  4. ^ 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, Bibcode:2012A&A...546A..61D, arXiv:1208.3048Freely accessible, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ a b c d 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, Bibcode:2015ApJ...804..146D, arXiv:1501.03154Freely accessible, doi:10.1088/0004-637X/804/2/146. 
  6. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367: 521–524, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289Freely accessible, doi:10.1051/0004-6361:20000451. 
  7. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037Freely accessible, doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ a b Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U. 
  9. ^ "ksi01 Cen -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-01-09. 
  10. ^ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x. 
  11. ^ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694−706, Bibcode:2012AstL...38..694G, arXiv:1606.09028Freely accessible, doi:10.1134/S1063773712110035. 
  12. ^ O'Meara, Stephen James (2016), Deep-Sky Companions: The Caldwell Objects (2nd ed.), Cambridge University Press, p. 392, ISBN 1316033538.