HD 118889
{{Short description|Binary star system in the constellation Boötes}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Boötes
| dec = {{DEC|+10|44|46.5827}}
| appmag_v = 5.57 {{nowrap|(6.35 + 6.47)}}
}}
{{Starbox character
| type = Main sequence
| variable =
}}
{{Starbox astrometry
| radial_v = {{val|−25.9|1.9}}
| parallax = 16.67
| p_error = 0.58
}}
{{Starbox orbit
| period = {{val|22.460|0.019}}
| axis = {{val|0.19983|0.00055}}
| inclination = {{val|43.50|0.40}}
| node = {{val|34.58|0.52}}
| periastron = B {{val|1929.850|0.024}}
| eccentricity = {{val|0.5450|0.0022}}
| periarg = {{val|359.93|0.79}}
}}
{{Starbox detail
| component1 = A
| radius =
| luminosity =
| temperature =
| metal_fe =
| gravity =
| rotational_velocity =
| age_myr =
| component2 = B
}}
{{Starbox catalog
| names = {{odlist | ADS=8987 | BD=+11°2589 | HD=118889 | HIP=66640 | HR=5138 | SAO=100654 | WDS=13396+1045 | DC=BU 612 }}
}}
{{Starbox reference
| Simbad = HD+118889
}}
{{Starbox end}}
HD 118889 is a binary star system in the northern constellation of Boötes. It is faintly visible to the naked eye as a point of light with an apparent visual magnitude of 5.57. The system is located at a distance of approximately 196 light years from the Sun based on stellar parallax, but is drifting closer with a radial velocity of −26 km/s.
The binary components of this system were first measured by S. W. Burnham in 1878 and it was given the discovery code BU 612. The pair are orbiting each other with a period of 22.46 years with an eccentricity (ovalness) of 0.545. The primary component is magnitude 6.35, with the secondary slightly fainter at magnitude 6.47.
A third star, {{val|3.5|ul="}} away, is a 12th-magnitude common-proper-motion companion. Any orbit would take over a thousand years.
References
{{reflist|refs=
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| title=XHIP: An extended hipparcos compilation
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}
| last1=Zorec | first1=J. | last2=Royer | first2=F.
| title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities
| journal=Astronomy & Astrophysics
| volume=537 | page=A120 | date=January 2012
| bibcode=2012A&A...537A.120Z | arxiv=1201.2052
| doi=10.1051/0004-6361/201117691 | s2cid=55586789 }}
| title=Binary Star Orbits from Speckle Interferometry. I. Improved Orbital Elements of 22 Visual Systems
| display-authors=1 | last1=Mason | first1=Brian D.
| last2=Douglass | first2=Geoffrey G. | last3=Hartkopf | first3=William I.
| journal=The Astronomical Journal
| volume=117 | issue=2 | pages=1023–1036 | date=February 1999
| doi=10.1086/300748 | bibcode=1999AJ....117.1023M | s2cid=122382211 }}
| first=F. | last=van Leeuwen
| title=Validation of the new Hipparcos reduction
| journal=Astronomy and Astrophysics
| volume=474 | issue=2 | pages=653–664
| date=November 2007 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357
| arxiv=0708.1752
| s2cid=18759600
}}
| display-authors=1
| last1=Holmberg | first1=J.
| last2=Nordström | first2=B.
| last3=Andersen | first3=J.
| title=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
| journal=Astronomy & Astrophysics
| volume=475 | issue=2 | pages=519–537 | date=2007
| arxiv=0707.1891
| bibcode=2007A&A...475..519H
| doi=10.1051/0004-6361:20077221
| s2cid=119054949 }}
| display-authors=1
| last1=Royer | first1=F.
| last2=Zorec | first2=J.
| last3=Gómez | first3=A. E.
| title=Rotational velocities of A-type stars. III. Velocity distributions
| journal=Astronomy and Astrophysics
| volume=463 | issue=2 | pages=671–682 |date=February 2007
| doi=10.1051/0004-6361:20065224
| bibcode=2007A&A...463..671R
| arxiv=astro-ph/0610785
| s2cid=18475298 }}
| last1=Mermilliod | first1=J.-C.
| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
| journal=Catalogue of Eggen's UBV Data. SIMBAD
| date=1986 | bibcode=1986EgUBV........0M
}}
| title=Dynamical Masses of a Selected Sample of Orbital Binaries
| last1=Malkov | first1=O. Yu. | last2=Tamazian | first2=V. S.
| last3=Docobo | first3=J. A. | last4=Chulkov | first4=D. A.
| display-authors=1 | journal=Astronomy & Astrophysics
| volume=546 | id=A69 | pages=5 | date=2012
| doi=10.1051/0004-6361/201219774 | doi-access=free
| bibcode =2012A&A...546A..69M }}
| url=http://www.astro.gsu.edu/wds/orb6/orb6frames.html
| title=Sixth Catalog of Orbits of Visual Binary Stars
| work=United States Naval Observatory
| access-date=2021-04-01 }}
}}
External links
- [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205138 HR 5138]
- [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J13395%2b1045AB CCDM J13395+1045]
- [http://aladin.u-strasbg.fr/AladinPreview?-c=BD%2B11++2589A&ident=BD%2B11++2589A&submit=Aladin+previewer Image HD 118889]
{{Stars of Boötes}}
Category:F-type main-sequence stars