Xi1 Centauri

Xi1 Centauri, Latinized from ξ1 Centauri, is a solitary[11] 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[12] due to intervening dust. Just 17 arc minutes to the east of Xi1 Centauri lies the galaxy NGC 4945.[13]

For other star systems with this Bayer designation, see Xi Centauri.
ξ1 Centauri

ξ1 Cen is the brightest star in the picture, at the right of the galaxy NGC 4945.
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]
Characteristics
Spectral type A0 V[3]
U−B color index +0.014[2]
B−V color index +0.030[2]
Astrometry
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
Distance221 ± 4 ly
(68 ± 1 pc)
Absolute magnitude (MV)+0.68[5]
Details[6]
Mass2.39 M☉
Radius2.7[7] R☉
Luminosity43.2[8] L☉
Surface gravity (log g)4.11±0.14 cgs
Temperature10,462±356 K
Rotational velocity (v sin i)185[9] km/s
Age125 Myr
Other designations
ξ1 Cen, CD−48° 7887, HD 113314, HIP 63724, HR 4933, SAO 223870.[10]
Database references
SIMBADdata

This is an A-type main sequence star with a stellar classification of A0 V.[3] It is about 125[6] million years old with a relatively high rate of spin, having a projected rotational velocity of 185 km/s.[9] The star has an estimated 2.4[6] times the mass of the Sun and about 2.7[7] times the Sun's radius. It is radiating 43[8] times the solar luminosity from its outer atmosphere at an effective temperature of 10,462 K.[6]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. 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. 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 (eds.), 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  5. 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, S2CID 119257644.
  6. 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  7. 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, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  8. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  9. 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.
  10. "ksi01 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-01-09.
  11. 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  12. Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  13. O'Meara, Stephen James (2016), Deep-Sky Companions: The Caldwell Objects (2nd ed.), Cambridge University Press, p. 392, ISBN 978-1316033531.
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