Alpha Centauri

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Alpha Centauri
Alpha, Beta and Proxima Centauri (1).jpg
α Centauri AB is the bricht starn tae the left, wi Proxima Centauri circled in reid. The bricht starn tae the richt is β Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Alpha Centauri A
Richt ascension 14h 39m 36.49400s[1]
Declination –60° 50′ 02.3737″[1]
Apparent magnitude (V) +0.01[2]
Alpha Centauri B
Richt ascension 14h 39m 35.06311s[1]
Declination –60° 50′ 15.0992″[1]
Apparent magnitude (V) +1.33[2]
Chairactereestics
A
Spectral type G2V[3]
U−B colour index +0.24[2]
B−V colour index +0.71[2]
B
Spectral teep K1V[3]
U−B colour index +0.68[2]
B−V colour index +0.88[2]
Astrometry
A
Radial velocity (Rv)−21.4±0.76[4] km/s
Proper motion (μ) RA: −3679.25[1] mas/yr
Dec.: 473.67[1] mas/yr
Parallax (π)754.81 ± 4.11[1] mas
Distance4.37[5] ly
Absolute magnitude (MV)4.38[6]
B
Radial velocity (Rv)−18.6±1.64[4] km/s
Proper motion (μ) RA: −3614.39[1] mas/yr
Dec.: 802.98[1] mas/yr
Parallax (π)754.81 ± 4.11[1] mas
Distance4.37[5] ly
Absolute magnitude (MV)5.71[6]
Details
Alpha Centauri A
Mass1.100[7] M
Radius1.2234±0.0053[8] R
Luminosity1.519[7] L
Surface gravity (log g)4.30[9] cgs
Temperatur5,790[7] K
Metallicity [Fe/H]0.20[7] dex
Rotation22[10] days
Age≈4.4[11] Gyr
Alpha Centauri B
Mass0.907[7] M
Radius0.8632±0.0037[8] R
Luminosity0.5002[7] L
Surface gravity (log g)4.37[9] cgs
Temperatur5,260[7] K
Metallicity0.23[7]
Rotation41[10] days
Age≈6.5[11] Gyr
Orbit[12]
PrimarA
CompanionB
Period (P)79.91±0.011 yr
Semi-major axis (a)17.57±0.022
Eccentricity (e)0.5179±0.00076
Inclination (i)79.205±0.041°
Longitude o the node (Ω)204.85±0.084°
Periastron epoch (T)1875.66±0.012
Argument o periastron (ω)
(seicontar)
231.65±0.076°
Ither designations
Toliman, Bungula, Gliese 559, FK5 538, CD−60°5483, CCDM J14396-6050, GC 19728
α Cen A: Rigil Kentaurus, Rigil Kent, α1 Centauri, HR 5459, HD 128620, GCTP 3309.00, LHS 50, SAO 252838, HIP 71683
α Cen B: α2 Centauri, HR 5460, HD 128621, LHS 51, HIP 71681
Database references
SIMBADAB
A
B
Exoplanet Archivedata
ARICNSdata
Extrasolar Planets
Encyclopaedia
data

Alpha Centauri (α Centauri, abbreviatit Alf Cen, α Cen) is the closest starn seestem tae the Solar Seestem, bein 4.37 light-years (1.34 pc) frae the Sun.

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D. 
  3. 3.0 3.1 Torres, C. A. O.; Quast, G. R.; da Silva, L .; de la Reza, R.; Melo, C. H. F.; Sterzik, M. (2006). "Search for associations containing young stars (SACY)". Astronomy and Astrophysics. 460 (3): 695–708. arXiv:astro-ph/0609258Freely accessible. Bibcode:2006A&A...460..695T. doi:10.1051/0004-6361:20065602. ISSN 0004-6361. 
  4. 4.0 4.1 Valenti, Jeff A.; Fischer, Debra A. (2005). "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs". The Astrophysical Journal Supplement Series. 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi:10.1086/430500. ISSN 0067-0049. 
  5. 5.0 5.1 Wilkinson, John (2012). "The Sun and Stars". New Eyes on the Sun. Astronomers' Universe. pp. 219–236. doi:10.1007/978-3-642-22839-1_10. ISBN 978-3-642-22838-4. ISSN 1614-659X. 
  6. 6.0 6.1 P. A. Wiegert; M. J. Holman (1997). "The stability of planets in the Alpha Centauri system". The Astronomical Journal. 113: 1445 – 1450. arXiv:astro-ph/9609106Freely accessible. Bibcode:1997AJ....113.1445W. doi:10.1086/118360. 
  7. 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Thévenin, F.; Provost, J.; Morel, P.; Berthomieu, G.; Bouchy, F.; Carrier, F. (2002). "Asteroseismology and calibration of alpha Cen binary system". Astronomy & Astrophysics. 392: L9. arXiv:astro-ph/0206283Freely accessible. Bibcode:2002A&A...392L...9T. doi:10.1051/0004-6361:20021074. 
  8. 8.0 8.1 Kervella, P.; Bigot, L.; Gallenne, A.; Thévenin, F. (January 2017). "The radii and limb darkenings of α Centauri A and B. Interferometric measurements with VLTI/PIONIER". Astronomy & Astrophysics. 597. A137. arXiv:1610.06185Freely accessible. Bibcode:2017A&A...597A.137K. doi:10.1051/0004-6361/201629505. 
  9. 9.0 9.1 Gilli G.; Israelian G.; Ecuvillon A.; Santos N. C.; Mayor M. (2006). "Abundances of Refractory Elements in the Atmospheres of Stars with Extrasolar Planets". Astronomy and Astrophysics. 449 (2): 723–36. arXiv:astro-ph/0512219Freely accessible. Bibcode:2006A&A...449..723G. doi:10.1051/0004-6361:20053850. libcode 2005astro.ph.12219G. 
  10. 10.0 10.1 Kervella, P.; Thévenin, F.; Ségransan, D.; Berthomieu, G.; Lopez, B.; Morel, P.; Provost, J. (2003). "The diameters of α Centauri A and B". Astronomy and Astrophysics. 404 (3): 1087–1097. arXiv:astro-ph/0303634Freely accessible. Bibcode:2003A&A...404.1087K. doi:10.1051/0004-6361:20030570. ISSN 0004-6361. 
  11. 11.0 11.1 E. E. Mamajek; L. A. Hillenbrand (2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". Astrophysical Journal. 687 (2): 1264–1293. arXiv:0807.1686Freely accessible. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785. 
  12. Pourbaix, D.; et al. (2002). "Constraining the difference in convective blueshift between the components of alpha Centauri with precise radial velocities". Astronomy and Astrophysics. 386 (1): 280–85. arXiv:astro-ph/0202400Freely accessible. Bibcode:2002A&A...386..280P. doi:10.1051/0004-6361:20020287. 

Coordinates: Sky map 14h 39m 36.4951s, −60° 50′ 02.308″