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 |
| Distance | 196 ± 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 | |
| Luminosity | 16.4[8] L☉ |
| Temperature | 7,105[8] K |
| Rotational velocity (v sin i) | 144[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 118889 is a binary star in the northern constellation of Boötes.
References
- 1 2 3 4 5 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.
- 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
- ↑ 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
- 1 2 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
- ↑ 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
- ↑ 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.
- ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 21 May 2017.
- 1 2 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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