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Multiple star in the constellation Centaurus From Wikipedia, the free encyclopedia
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]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
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 mas[6] |
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 mas[7] |
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 |
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]
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