| 词条 | W Ursae Minoris |
| 释义 |
|name= W Ursae Minoris }}{{Starbox observe | epoch=J2000 |ra= {{RA|16|08|27.27}}[1] |dec= {{DEC|+86|11|59.6}} | appmag_v=8.51-9.59[2] |constell= Ursa Minor }}{{Starbox character | class=A2V | b-v= | u-b= | variable= }}{{Starbox astrometry | radial_v=-12.8 ± 2 | prop_mo_ra=−10.62 ± 0.68[3] | prop_mo_dec=16.14 ± 0.73[3] | parallax=2.04 | p_error=0.64 | parallax_footnote=[2] | absmag_v= }}{{Starbox catalog | names= HD 150265, HIP 79069, SAO 2692.[1] }}{{Starbox reference | Simbad = W+UMi }}{{Starbox end}}W Ursae Minoris is a multiple star system in the constellation Ursa Minor. Its apparent magnitude ranges from 8.51 to 9.59 over 1.7 days as one star passes in front of the other relative to observers on Earth.[3] The combined spectrum of the system is A2V, but the masses of the two component stars are unknown. A slight change in the orbital period in 1973 suggests there is a third component of the multiple star system—most likely a red dwarf—with an orbital period of 62.2 ± 3.9 years.[4] References1. ^1 {{cite simbad | title=W UMi | accessdate=18 July 2015}} {{Stars of Ursa Minor}}2. ^1 2 {{citation | 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}} 3. ^1 {{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=37380 |title=W Ursae Minoris |author=Watson, Christopher |date=4 January 2010 |work=AAVSO Website|publisher=American Association of Variable Star Observers|accessdate=18 July 2015}} 4. ^{{cite journal | title=Period analysis of three close binary systems: TW And, TT Her and W UMi |author1=Kreiner, J. M. |author2=Pribulla, T. |author3=Tremko, J. |author4=Stachowski, G. S. |author5=Zakrzewski, B. | journal =Monthly Notices of the Royal Astronomical Society | volume = 383 | issue = 4 |pages= 1506–12|date=2008 |doi=10.1111/j.1365-2966.2007.12652.x |bibcode=2008MNRAS.383.1506K}} 3 : Ursa Minor (constellation)|Eclipsing binaries|Objects with variable star designations |
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