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HD 125628 is a binary star[3] system in the constellation Centaurus. It is faintly visible to the naked eye with a combined apparent visual magnitude of 4.76.[2] The distance to this system is approximately 380 light years based on parallax. It is drifting further away from the Sun with a radial velocity of +15 km/s.[2] The absolute magnitude is −0.55.[2]

HD 125628
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 14h 22m 37.07301s[1]
Declination −58° 27′ 32.8193″[1]
Apparent magnitude (V) 4.76[2] (5.09 + 6.94)[3]
Characteristics
Spectral type G9III + F5V[3]
B−V color index 0.795±0.003[2]/0.45[4]
Astrometry
Radial velocity (Rv)+14.6±2.8[2] km/s
Proper motion (μ) RA: −43.66±0.90[1] mas/yr
Dec.: +17.22±0.76[1] mas/yr
Parallax (π)8.51 ± 1.11 mas[1]
Distanceapprox. 380 ly
(approx. 120 pc)
Absolute magnitude (MV)−0.55[2]
Details
A
Rotational velocity (v sin i)5.5[4] km/s
Age3.6[4] Gyr
B
Rotational velocity (v sin i)6.3[4] km/s
Other designations
CPD−57°6619, HD 125628, HIP 70264, HR 5371, SAO 241673[5]
Database references
SIMBADdata

The primary component of this system, component A, is an aging giant star with a stellar classification of G9III[3] and a visual magnitude of 5.09.[3] The secondary companion, designated component B, is a magnitude 6.94[3] star located at an angular separation of 9.10″ from the primary, along a position angle of 157°, as of 2016.[6] It is an F-type main-sequence star with a class of F5V.[3]


References


  1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  4. Desidera, S.; et al. (August 2006). "Spectroscopic characterization of a sample of southern visual binaries". Astronomy and Astrophysics. 454 (2): 553–558. Bibcode:2006A&A...454..553D. doi:10.1051/0004-6361:20064895.
  5. "HD 125628". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-27.
  6. Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122: 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.


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