Astronomy:4 Centauri

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Short description: Star in the constellation Centaurus
4 Centauri
Location of 4 Centauri (circled in red)
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000.0      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Centaurus[1]
A
Right ascension  13h 53m 12.53829s[2]
Declination −31° 55′ 39.4304″[2]
Apparent magnitude (V) +4.72[3]
B
Right ascension  13h 53m 12.43506s[4]
Declination −31° 55′ 54.1506″[4]
Apparent magnitude (V) +8.47[5])
Characteristics
A
Evolutionary stage main sequence[2]
Spectral type B6IV[6]
U−B color index −0.56[7]
B−V color index −0.14[7]
B
Evolutionary stage main sequence[4]
Spectral type Am[6]
U−B color index +0.10[8]
B−V color index +0.30[8]
Astrometry
A
Radial velocity (Rv)+5.2±2[9] km/s
Proper motion (μ) RA: −10.428[2] mas/yr
Dec.: −10.710[2] mas/yr
Parallax (π)4.8225 ± 0.1539[2] mas
Distance680 ± 20 ly
(207 ± 7 pc)
Absolute magnitude (MV)−1.66[1]
B
Radial velocity (Rv)+9±10[9] km/s
Proper motion (μ) RA: −10.905[4] mas/yr
Dec.: −10.625[4] mas/yr
Parallax (π)4.1269 ± 0.1312[4] mas
Distance790 ± 30 ly
(242 ± 8 pc)
Orbit[6]
Primary4 Cen Aa
Companion4 Cen Ab
Period (P)6.930137±0.000015 d
Eccentricity (e)0.25±0.10
Argument of periastron (ω)
(secondary)		152±17°
Semi-amplitude (K1)
(primary)		21.0±1.5 km/s
Orbit[6]
Primary4 Cen Ba
Companion4 Cen Bb
Period (P)4.8390±0.0001 d
Eccentricity (e)0.05±0.02
Periastron epoch (T)2442916.55±0.09
Argument of periastron (ω)
(secondary)		51±20°
Semi-amplitude (K1)
(primary)		16.9±3.5 km/s
Details
Aa
Mass7.7[10] M☉
Radius6.2[2] R☉
Luminosity687[11] L☉
Surface gravity (log g)3.43[2] cgs
Temperature14,322[11] K
Metallicity [Fe/H]−1.06[2] dex
Rotation27.2 days[12]
Age51[13] Myr
Ab
Mass0.75[10] M☉
Details
Ba
Mass1.9[10] M☉
Radius2.48[14] R☉
Luminosity17.0[14] L☉
Surface gravity (log g)3.88[14] cgs
Temperature7,440[14] K
Bb
Mass0.22[10] M☉
Other designations
h Cen, 4 Cen, HD 120955, HR 5221, CCDM J13532-3156[15]
A: CD−31°10729, GC 18755, HIP 67786, SAO 204944[16]
B: CD−31°10727, GC 18754, SAO 204943[17]
Database references
SIMBADdata
4 Cen B

4 Centauri is a multiple star in the constellation Centaurus, approximately 640 light years from Earth. It has a combined apparent magnitude of +4.71.[18] The primary is a blue-white B-type subgiant with a spectroscopic companion, while the secondary is an Am star also with a spectroscopic companion.

4 Centauri is a hierarchical quadruple star system. The primary component of the system, 4 Centauri A, is a spectroscopic binary, meaning that its components cannot be resolved but periodic Doppler shifts in its spectrum show that it must be orbiting. 4 Centauri A has an orbital period of 6.927 days and an eccentricity of 0.23. Because light from only one of the stars can be detected (i.e. it is a single-lined spectroscopic binary), some parameters such as its inclination are unknown.[19] The secondary component, is also a single-lined spectroscopic binary. It has an orbital period of 4.839 days and an eccentricity of 0.05. The secondary component is a metallic-lined A-type star. The two pairs themselves are separated by 14 arcseconds; one orbit would take at least 55,000 years.[6]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ Nicolet, B. (1978). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy and Astrophysics 34: 1. Bibcode: 1978A&AS...34....1N. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Levato, H.; Malaroda, S.; Morrell, N.; Solivella, G. (1987). "Stellar multiplicity in the Scorpius-Centaurus association". Astrophysical Journal Supplement Series 64: 487–503. doi:10.1086/191204. Bibcode: 1987ApJS...64..487L. 
  7. ↑ 7.0 7.1 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". Journal of the American Association of Variable Star Observers (Jaavso) 42 (2): 443. Bibcode: 2014JAVSO..42..443M. 
  8. ↑ 8.0 8.1 Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HGMN and Am stars". Astronomy and Astrophysics 498 (3): 961. doi:10.1051/0004-6361/200810788. Bibcode: 2009A&A...498..961R. 
  9. ↑ 9.0 9.1 Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications 30: 57. Bibcode: 1967IAUS...30...57E. 
  10. ↑ 10.0 10.1 10.2 10.3 Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. Bibcode: 2018ApJS..235....6T. 
  11. ↑ 11.0 11.1 Quintana, Alexis L.; Wright, Nicholas J.; Martínez García, Juan (2025). "A census of OB stars within 1 KPC and the star formation and core collapse supernova rates of the Milky Way". Monthly Notices of the Royal Astronomical Society 538 (3): 1367. doi:10.1093/mnras/staf083. Bibcode: 2025MNRAS.538.1367Q. 
  12. ↑ Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G. et al. (2018). "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey". The Astronomical Journal 155 (1): 39. doi:10.3847/1538-3881/aa9bf4. Bibcode: 2018AJ....155...39O. 
  13. ↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 KPC from the Sun". Monthly Notices of the Royal Astronomical Society 410 (1): 190. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T. 
  14. ↑ 14.0 14.1 14.2 14.3 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  15. ↑ "* 4 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+4+Cen. 
  16. ↑ "* 4 Cen A". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+4+Cen+A. 
  17. ↑ "* 4 Cen B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+4+Cen+B. 
  18. ↑ Paunzen, E. (2022). "Catalogue of stars measured in the Geneva seven-colour photometric system". Astronomy and Astrophysics 661: A89. doi:10.1051/0004-6361/202142355. Bibcode: 2022A&A...661A..89P. 
  19. ↑ Paddock, G. F. (1917). "The Spectroscopic Binary H 4 Centauri". Publications of the Astronomical Society of the Pacific 29 (167): 56. doi:10.1086/122588. Bibcode: 1917PASP...29...56P. https://zenodo.org/record/1431275. 



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