HD 118889

HD 118889 is a binary star in the northern constellation of Boötes.

HD 118889
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 13h 39m 34.61613s[1]
Declination +10° 44′ 46.5827″[1]
Apparent magnitude (V) 5.58[2] (6.35 + 6.47)[3]
Characteristics
Spectral type F0V[4]
U−B color index +0.045[2]
B−V color index +0.33[2]
Astrometry
Radial velocity (Rv)-25.9[5] km/s
Proper motion (μ) RA: -114.96[1] mas/yr
Dec.: -11.74[1] mas/yr
Parallax (π)16.67 ± 0.58[1] mas
Distance196 ± 7 ly
(60 ± 2 pc)
Absolute magnitude (MV)+2.40[6]
Orbit[7]
Period (P)22.460 ± 0.019 yr
Semi-major axis (a)0.19983 ± 0.00055″
Eccentricity (e)0.5450 ± 0.0022
Inclination (i)43.50 ± 0.40°
Longitude of the node (Ω)34.58 ± 0.52°
Periastron epoch (T)B 1929.850 ± 0.024
Argument of periastron (ω)
(secondary)		359.93 ± 0.79°
Details
Luminosity16.4[8] L☉
Temperature7,105[8] K
Rotational velocity (v sin i)144[4] km/s
Other designations
BD+11° 2589, HD 118889, HIP 66640, HR 5138, SAO 100654.
Database references
SIMBADdata

References
  1. van Leeuwen, F. (November 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.
  2. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  3. Malkov, O. Yu.; et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
  4. Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224
  5. Holmberg, J.; et al. (2007), "The Geneva-Copenhagen survey of the Solar neighbourhood. II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk", Astronomy & Astrophysics, 475 (2): 519–537, arXiv:0707.1891, Bibcode:2007A&A...475..519H, doi:10.1051/0004-6361:20077221
  6. Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911.
  7. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 21 May 2017.
  8. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x


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