Astronomy:4 Centauri
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 53m 12.53953s[1] |
| Declination | −31° 55′ 39.3947″[1] |
| Apparent magnitude (V) | +4.73[2](+4.72[3] / +8.47[4]) |
| Characteristics | |
| Spectral type | B6IV[5] / Am[5] |
| U−B color index | −0.56[2] |
| B−V color index | −0.14[2] |
| Astrometry | |
| Radial velocity (Rv) | +5.2 ± 2[6] km/s |
| Proper motion (μ) | RA: -12.72[1] mas/yr Dec.: -9.48[1] mas/yr |
| Parallax (π) | 5.12 ± 0.70[1] mas |
| Distance | approx. 640 ly (approx. 200 pc) |
| Absolute magnitude (MV) | −1.66[7] |
| Orbit[5] | |
| Primary | 4 Cen Aa |
| Companion | 4 Cen Ab |
| Period (P) | 6.930137 ± 0.000015 |
| Eccentricity (e) | 0.25 ± 0.10 |
| Periastron epoch (T) | 2418823.406 ± 0.10 |
| Argument of periastron (ω) (secondary) | 152 ± 17° |
| Semi-amplitude (K1) (primary) | 21.0 ± 1.5 km/s |
| Orbit[5] | |
| Primary | 4 Cen Ba |
| Companion | 4 Cen Bb |
| Period (P) | 4.8390 ± 0.0001 |
| 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 |
| Other designations | |
h Cen, HD 120955, HR 5221, HIP 67786, CCDM J13532-3156 | |
| 4 Cen A[8]: SAO 204944, GC 18755, CD–31° 10729[9] | |
| 4 Cen B: SAO 204943, GC 18754, CD–31° 10727[10] | |
| Database references | |
| SIMBAD | 4 Cen |
| 4 Cen A | |
| 4 Cen B | |
4 Centauri is a star in the constellation Centaurus. It is a blue-white B-type subgiant with an apparent magnitude of +4.75 and is approximately 640 light years from Earth.
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.[11] 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.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL. Vizier catalog entry
- ↑ 2.0 2.1 2.2 Mendoza, E. E. (1974). "Multicolor photometry of metallic-line stars. III. A photometric catalogue". Revista Mexicana de Astronomía y Astrofísica 1: 175. Bibcode: 1974RMxAA...1..175M. Color indices accessed using SIMBAD.
- ↑ 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.
- ↑ Nicolet, B. (1978). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy and Astrophysics 34: 1. Bibcode: 1978A&AS...34....1N.
- ↑ 5.0 5.1 5.2 5.3 5.4 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.
- ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode: 1953GCRV..C......0W.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ "* 4 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+4+Cen.
- ↑ "* 4 Cen A". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+4+Cen+A.
- ↑ "* 4 Cen B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+4+Cen+B.
- ↑ 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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