HD 108541

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HD 108541 (u Centauri)
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension  12h 28m 22.46490s[1]
Declination −39° 02′ 28.2168″[1]
Apparent magnitude (V) 5.448[2]
Spectral type B8/9V[2]
B−V color index -0.08[3]
Radial velocity (Rv)5.00[4] km/s
Proper motion (μ) RA: -28.01[1] mas/yr
Dec.: -13.76[1] mas/yr
Parallax (π)7.47 ± 0.28[1] mas
Distance440 ± 20 ly
(134 ± 5 pc)
Absolute magnitude (MV)0.28[5]
Mass2.9[5] M
Luminosity265[6] L
Temperature10990[5] K
Age0.174[5] Gyr
Other designations
u Cen, CD–34° 7753, HD 108541, HIP 60855, SAO 203508, HR 4748, GC 17001[2]
Database references

HD 108541, also known by its Bayer designation u Centauri is a star located in the constellation Centaurus, It is also known as HR 4748. The apparent magnitude of the star is about 5.4, 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] The spectral type of HD 108541 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. HD 108541 is just under 3 times more massive than the Sun[5] and has a temperature of about 11,000 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. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c "* u Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 February 2017.
  3. ^ Corben, P. M. (1966). "Photoelectric magnitudes and colours for bright southern stars". Monthly Notes of the Astron. Soc. Southern Africa. 25: 44. Bibcode:1966MNSSA..25...44C.
  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:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. ^ a b c d e f 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.
  6. ^ 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.