Astronomy:D Centauri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 12h 14m 02.697s[1] |
| Declination | −45° 43′ 26.10″[1] |
| Apparent magnitude (V) | +5.31[2] (5.78 + 6.98)[3] |
| Characteristics | |
| Spectral type | K3III[4] (K4IIIab + K2IIIb)[5] |
| U−B color index | +1.82/1.19[5] |
| B−V color index | +1.400±0.003[2]/1.21[5] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | +10.27±0.68[6] km/s |
| Proper motion (μ) | RA: −37.186[6] mas/yr Dec.: 6.606[6] mas/yr |
| Parallax (π) | 5.3350 ± 0.1399[6] mas |
| Distance | 610 ± 20 ly (187 ± 5 pc) |
| Absolute magnitude (MV) | −0.88[2] |
| B | |
| Proper motion (μ) | RA: −33.604[7] mas/yr Dec.: 5.434[7] mas/yr |
| Parallax (π) | 4.9297 ± 0.0550[7] mas |
| Distance | 662 ± 7 ly (203 ± 2 pc) |
| Details | |
| A | |
| Radius | 42.8+1.1 −2.13[6] R☉ |
| Luminosity | 434±13[6] L☉ |
| Temperature | 4,026+104 −50[6] K |
| B | |
| Radius | 13.5+1.7 −1.9[7] R☉ |
| Luminosity | 90.5±1.4[7] L☉ |
| Temperature | 4,853+275 −392[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
D Centauri is a double star in the southern constellation of Centaurus.[8] The system is faintly visible to the naked eye as a point of light with a combined apparent magnitude of +5.31;[2] the two components are of magnitude 5.78 and 6.98, respectively.[3] It is located at a distance of approximately 610 light years from the Sun based on parallax, and is drifting further away with a radial velocity of ~10 km/s.[6]
The dual nature of this star was announced by C. Rumker in 1837. As of 2015, the pair had an angular separation of 2.70″ along a position angle of 242°.[3] This orange-hued double has a combined stellar classification of K3III,[4] matching an aging giant star that has exhausted the supply of hydrogen at its core. In 1984, C. J. Corbally found a class of K4IIIab for the primary and K2IIIb for the fainter secondary.[5]
References
- ↑ 1.0 1.1 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. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122: 3466–3471. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
- ↑ 4.0 4.1 Houk, N. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. 2. Dept. of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H.
- ↑ 5.0 5.1 5.2 5.3 Corbally, C. J. (1984). "Close visual binaries. I - MK classifications". The Astrophysical Journal Supplement Series 55: 657. doi:10.1086/190973. Bibcode: 1984ApJS...55..657C.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 8.0 8.1 "D Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=D+Cen.
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