| 词条 | 55 Ursae Majoris |
| 释义 |
|name= 55 Ursae Majoris }}{{Starbox observe |epoch=J2000 |constell=Ursa Major |ra= {{RA|11|19|07.89965}}[1] |dec= {{DEC|+38|11|08.0285}}[1] |appmag_v=4.80[3] (4.78 / 5.3)[2] }}{{Starbox character |class=A2V[3] (A1V + A2V + A1V)[6] |b-v=+0.09[4] |u-b=+0.04[4] }}{{Starbox astrometry |radial_v=-3.0 ± 2[5] |prop_mo_ra=-58.80[1] |prop_mo_dec=-65.33[1] |parallax=17.00 |p_error=0.34 |parallax_footnote=[1] |absmag_v=-0.09 ± 0.20[6] }}{{Starbox orbit |reference=[6] |primary=55 UMa Aa |name=55 UMa Ab |period_unitless=2.5537985 d |periastron=2449602.368 |k1=79.1 |k2=89.1 |eccentricity=0.323 |periarg=116.8 }}{{Starbox orbit |reference=[6] |primary=55 UMa A |name=55 UMa B |period_unitless=1872.7 ± 7.4 d |periastron=2448805 ± 18 |axis=0.0913 ± 0.0009 |inclination=64.8 ± 0.8 |node=130.0 ± 0.8 |eccentricity=0.126 ± 0.008 |periarg=223.9 ± 3.7 |k1=8.4 ± 1.3 |k2=20.2 ± 6.9 }}{{Starbox detail |source=[6] |component1=55 UMa Aa |gravity=4.25 |rotational_velocity=30 ± 4 |temperature=9230 ± 230 |mass=2.0 |component2=55 UMa Ab |gravity2=4.25 |rotational_velocity2=45 ± 5 |temperature2=8810 ± 250 |mass2=1.8 }}{{Starbox detail|no_heading=y |component1=55 UMa B |gravity=4.25 |rotational_velocity=55 ± 5 |temperature=9290 ± 190 |mass=2.1 }}{{Starbox catalog |names={{odlist|BD=+38 2225|FK5=1293|HD=98353|HIP=55266|HR=4380|SAO=62491}} }}{{Starbox reference |Simbad=55+UMa }}{{Starbox end}}55 Ursae Majoris (55 UMa) is a triple star system in the constellation Ursa Major. Its apparent magnitude is 4.80. Two stars form a close spectroscopic binary with an orbital period of 2.55 days. The third star orbits the central pair every 1873 days.[6] All three stars are A-type main-sequence stars.[6] References1. ^1 2 3 4 {{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357}} {{Stars of Ursa Major}}{{main-star-stub}}2. ^{{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|work=United States Naval Observatory|accessdate=24 June 2017}} 3. ^1 {{cite simbad|title=* 55 UMa|access-date=23 February 2013}} 4. ^1 {{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV data|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M}} 5. ^{{cite journal|title=General catalogue of stellar radial velocities|journal=Washington|author=Wilson, Ralph Elmer|date=1953|bibcode=1953GCRV..C......0W}} 6. ^1 2 3 4 5 6 {{cite journal|bibcode=1997ApJ...485..350L|doi=10.1086/304418|title=Tomographic Separation of Composite Spectra. V. The Triple Star System 55 Ursae Majoris|journal=The Astrophysical Journal|volume=485|pages=350|year=1997|last1=Liu|first1=Ning|last2=Gies|first2=Douglas R.|last3=Xiong|first3=Ying|last4=Riddle|first4=Reed L.|last5=Bagnuolo, Jr.|first5=William G.|last6=Barry|first6=Donald J.|last7=Ferrara|first7=Elizabeth C.|last8=Hartkopf|first8=William I.|last9=Hooda|first9=Jagbir S.|last10=Mason|first10=Brian D.|last11=McAlister|first11=Harold A.|last12=Roberts, Jr.|first12=Lewis C.|last13=Sowers|first13=Jon W.}} 9 : Ursa Major (constellation)|A-type main-sequence stars|Spectroscopic binaries|Triple star systems|Flamsteed objects|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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