D Centauri

For d Centauri, see HD 117440.
D Centauri
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]
Distance610 ± 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]
Distance662 ± 7 ly
(203 ± 2 pc)
Details
A
Radius42.8+1.1
−2.13[6] R☉
Luminosity434±13[6] L☉
Temperature4,026+104
−50[6] K
B
Radius13.5+1.7
−1.9[7] R☉
Luminosity90.5±1.4[7] L☉
Temperature4,853+275
−392[7] K
Other designations
D Cen, CD−45°7630, GC 16703, HD 106321, HIP 59654, HR 4652, SAO 223297, CCDM J12140-4543[8]
Database references
SIMBADdata

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]

  1. ^ a b Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Mason_et_al_2014 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Corbally1984 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference GaiaDR2A was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference GaiaDR2B was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).