Upsilon1 Centauri

For other stars with this Bayer designation, see υ Centauri.
υ1 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 13h 58m 40.75s[1]
Declination −44° 48′ 12.9″[1]
Apparent magnitude (V) +3.87[2]
Characteristics
Spectral type B2 IV/V[3]
B−V color index −0.208±0.011[2]
Astrometry
Radial velocity (Rv)+9.2±1.4[4] km/s
Proper motion (μ) RA: −27.51±0.15[1] mas/yr
Dec.: −22.44±0.13[1] mas/yr
Parallax (π)7.63 ± 0.16 mas[1]
Distance427 ± 9 ly
(131 ± 3 pc)
Absolute magnitude (MV)−1.72[2]
Details
Mass7.9±0.1[5] M☉
Radius3.74±0.34[6] R☉
Luminosity1,884[2] L☉
Surface gravity (log g)4.15±0.07[6] cgs
Temperature21,411±377[6] K
Rotational velocity (v sin i)124[4] km/s
Age13.0±2.0[5] Myr
Other designations
υ1 Cen, CD−44° 9010, FK5 3112, HD 121790, HIP 68282, HR 5249, SAO 224585[7]
Database references
SIMBADdata

Upsilon1 Centauri, Latinized from υ1 Centauri, is a single[8] star in the southern constellation of Centaurus. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.87.[2] The distance to this object is approximately 427 light years based on parallax,[1] and is receding with a radial velocity of +9 km/s.[4] It is a member of the Lower Centaurus Crux group of the Scorpius–Centaurus association.[2]

The stellar classification of this object is B2 IV/V,[2] matching a massive B-type star with a luminosity class displaying mixed traits of a main sequence and a subgiant star. It is 13[5] million years old and is spinning with a projected rotational velocity of 124 km/s.[4] The star has 7.9[5] times the mass of the Sun and 3.7[6] times the Sun's radius. It is radiating 1,884[2] times the luminosity of the Sun from its photosphere at an effective temperature of 21,411 K.[6]

  1. ^ a b c d e f Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Hiltner1969 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Jilinski2006 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference aj129_3_1642 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).