Phi Centauri

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φ Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 13h 58m 16.27s[1]
Declination −42° 06′ 02.7″[1]
Apparent magnitude (V) +3.83
Characteristics
Spectral type B2 IV[2]
U−B color index −0.83
B−V color index −0.21
Variable type none
Astrometry
Radial velocity (Rv) +6 km/s
Proper motion (μ) RA: -22.77 ± 0.15[1] mas/yr
Dec.: -20.13 ± 0.12[1] mas/yr
Parallax (π) 6.21 ± 0.17[1] mas
Distance 530 ± 10 ly
(161 ± 4 pc)
Absolute magnitude (MV) −1.93
Details
Mass 8.5 ± 0.3[2] M
Radius 4.19 ± 0.35[3] R
Luminosity 4,000[4] L
Surface gravity (log g) 4.08 ± 0.07[3] cgs
Temperature 21,638 ± 388[3] K
Age 18.0 ± 3.2[2] Myr
Other designations
HR 5248, HD 121743, CD−41°8329, HIP 68245, SAO 224577, GC 18874
Database references
SIMBAD data

Phi Centauri (φ Cen, φ Centauri) is a star in the constellation Centaurus. φ Centauri is a blue-white B-type subgiant with an apparent magnitude of +3.83. It is approximately 530 light years from Earth.

This star is a proper motion member of the Upper-Centaurus Lupus sub-group in the Scorpius-Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.[4]

References[edit]

  1. ^ a b c d e 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.  Vizier catalog entry
  2. ^ a b c Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x 
  3. ^ a b c Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855 
  4. ^ a b de Geus, P. T.; de Zeeuw; Lub, J. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics 216 (1-2): 44–61, Bibcode:1989A&A...216...44D