HD 117440

d Centauri A/B
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 13h 31m 02.66s[1]
Declination −39° 24′ 26.3″[1]
Apparent magnitude (V) +4.5/+4.7
Characteristics
Spectral type G8III/G9III
U−B color index +1.03
B−V color index +1.17
Variable type none
Astrometry
Radial velocity (Rv)−2 km/s
Proper motion (μ) RA: -15.67 ± 0.47[1] mas/yr
Dec.: -10.49 ± 0.31[1] mas/yr
Parallax (π)3.60 ± 0.49[1] mas
Distanceapprox. 900 ly
(approx. 280 pc)
Absolute magnitude (MV)−3.4/−3.2
Other designations
HR 5089, HD 117440, CD−38°8592, HIP 65936, SAO 204545, GC 18254, CCDM J13310-3924
Database references
SIMBADdata

HD 117440, also known by its Bayer designation d Centauri (d Cen), is a binary star in the constellation Centaurus. It is approximately 900 light years from Earth.

Both components are yellow G-type giant stars. The primary, d Centauri A, has an apparent magnitude of +4.5, while the secondary, d Centauri B, has an apparent magnitude of +4.7. The two stars orbit around their common centre of mass once every 78.7 years and the secondary has a semi-major axis of 0.165 arcseconds.

References