Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Double_star> ?p ?o }
- Double_star abstract "In observational astronomy, a double star is a pair of stars that appear close to each other in the sky as seen from Earth when viewed through an optical telescope.This can happen either because the pair forms a binary star, i.e. a binary system of stars in mutual orbit, gravitationally bound to each other, or because it is an optical double, a chance alignment of two stars in the sky that lie at different distances. Binary stars are important to stellar astronomers as knowledge of their motions allows direct calculation of stellar mass and other stellar parameters.Since the beginning of the 1780s, both professional and amateur double star observers have telescopically measured the distances and angles between double stars to determine the relative motions of the pairs. If the relative motion of a pair determines a curved arc of an orbit, or if the relative motion is small compared to the common proper motion of both stars, it may be concluded that the pair is in mutual orbit as a binary star. Otherwise, the pair is optical. Multiple stars are also studied in this way, although the dynamics of multiple stellar systems are more complex than those of binary stars.There are three types of paired stars: optical doubles—unrelated stars that appear close together through chance alignment with Earth visual binaries—gravitationally-bound stars that are separately visible with a telescope non-visual binaries—stars whose binary status was deduced through more esoteric means such as occultation (eclipsing binaries), spectroscopy (spectroscopic binaries), or anomalies in proper motion (astrometric binaries).Conceptually, there is no difference between the latter two categories, and improvements in telescopes can shift previously non-visual binaries into the visual class, as happened with Polaris in 2006. Thus it is only the inability to observe the third group telescopically that makes the difference.".
- Double_star thumbnail Masquerading_as_a_double_star.jpg?width=300.
- Double_star wikiPageID "53603".
- Double_star wikiPageLength "14940".
- Double_star wikiPageOutDegree "85".
- Double_star wikiPageRevisionID "682874948".
- Double_star wikiPageWikiLink 44_Boötis.
- Double_star wikiPageWikiLink ADS_16402.
- Double_star wikiPageWikiLink Alpha1_Capricorni.
- Double_star wikiPageWikiLink Alpha2_Capricorni.
- Double_star wikiPageWikiLink Alpha_Capricorni.
- Double_star wikiPageWikiLink Alpha_Centauri.
- Double_star wikiPageWikiLink Alpha_Crucis.
- Double_star wikiPageWikiLink Apparent_magnitude.
- Double_star wikiPageWikiLink Astronomical_spectroscopy.
- Double_star wikiPageWikiLink Astronomy.
- Double_star wikiPageWikiLink Bayer_designation.
- Double_star wikiPageWikiLink Benedetto_Castelli.
- Double_star wikiPageWikiLink Binary_star.
- Double_star wikiPageWikiLink Binary_stars_in_fiction.
- Double_star wikiPageWikiLink Brisbane_Observatory.
- Double_star wikiPageWikiLink Capella.
- Double_star wikiPageWikiLink Castor_(star).
- Double_star wikiPageWikiLink Category:Double_stars.
- Double_star wikiPageWikiLink Category:Multiple_stars.
- Double_star wikiPageWikiLink Category:Star_types.
- Double_star wikiPageWikiLink Crux.
- Double_star wikiPageWikiLink Earth.
- Double_star wikiPageWikiLink Eta1_Coronae_Australis.
- Double_star wikiPageWikiLink Eta2_Coronae_Australis.
- Double_star wikiPageWikiLink Friedrich_Georg_Wilhelm_von_Struve.
- Double_star wikiPageWikiLink Galileo_Galilei.
- Double_star wikiPageWikiLink Gamma_Arietis.
- Double_star wikiPageWikiLink Giovanni_Battista_Riccioli.
- Double_star wikiPageWikiLink Gravity.
- Double_star wikiPageWikiLink James_Dunlop.
- Double_star wikiPageWikiLink Kappa1_Coronae_Australis.
- Double_star wikiPageWikiLink Kappa2_Coronae_Australis.
- Double_star wikiPageWikiLink Magnitude_(astronomy).
- Double_star wikiPageWikiLink Mizar_and_Alcor.
- Double_star wikiPageWikiLink Nicolas-Louis_de_Lacaille.
- Double_star wikiPageWikiLink Occultation.
- Double_star wikiPageWikiLink Orbit.
- Double_star wikiPageWikiLink Otto_Struve.
- Double_star wikiPageWikiLink P_Eridani.
- Double_star wikiPageWikiLink Parallax.
- Double_star wikiPageWikiLink Polaris.
- Double_star wikiPageWikiLink Position_angle.
- Double_star wikiPageWikiLink Procyon.
- Double_star wikiPageWikiLink Proper_motion.
- Double_star wikiPageWikiLink Proxima_Centauri.
- Double_star wikiPageWikiLink Radial_velocity.
- Double_star wikiPageWikiLink Robert_Hooke.
- Double_star wikiPageWikiLink Sherburne_Wesley_Burnham.
- Double_star wikiPageWikiLink Sirius.
- Double_star wikiPageWikiLink Star.
- Double_star wikiPageWikiLink Star_system.
- Double_star wikiPageWikiLink Telescope.
- Double_star wikiPageWikiLink Theta_Muscae.
- Double_star wikiPageWikiLink Theta_Muscae_B.
- Double_star wikiPageWikiLink Ursa_Major.
- Double_star wikiPageWikiLink Washington_Double_Star_Catalog.
- Double_star wikiPageWikiLink William_Herschel.
- Double_star wikiPageWikiLink Winnecke_4.
- Double_star wikiPageWikiLink Xi_Centauri.
- Double_star wikiPageWikiLink Xi_Sagittarii.
- Double_star wikiPageWikiLink File:Artist’s_impression_of_the_discs_around_the_young_stars_HK_Tauri_A_and_B.jpg.
- Double_star wikiPageWikiLink File:Masquerading_as_a_double_star.jpg.
- Double_star wikiPageWikiLinkText "Double star".
- Double_star wikiPageWikiLinkText "Double star#Designations".
- Double_star wikiPageWikiLinkText "Double".
- Double_star wikiPageWikiLinkText "HJ".
- Double_star wikiPageWikiLinkText "companion star".
- Double_star wikiPageWikiLinkText "companions".
- Double_star wikiPageWikiLinkText "double or multiple star".
- Double_star wikiPageWikiLinkText "double or multiple stars".
- Double_star wikiPageWikiLinkText "double or multiple".
- Double_star wikiPageWikiLinkText "double star designation".
- Double_star wikiPageWikiLinkText "double star system".
- Double_star wikiPageWikiLinkText "double star".
- Double_star wikiPageWikiLinkText "double system".
- Double_star wikiPageWikiLinkText "double".
- Double_star wikiPageWikiLinkText "optical binary".
- Double_star wikiPageWikiLinkText "optical companion".
- Double_star wikiPageWikiLinkText "optical companions".
- Double_star wikiPageWikiLinkText "optical components".
- Double_star wikiPageWikiLinkText "optical double".
- Double_star wikiPageWikiLinkText "optical".
- Double_star wikiPageWikiLinkText "pair".
- Double_star wikiPageWikiLinkText "triple star".
- Double_star wikiPageWikiLinkText "twin star".
- Double_star wikiPageWikiLinkText "visual companion star".
- Double_star wikiPageWikiLinkText "visual companion".
- Double_star wikiPageWikiLinkText "visual companions".
- Double_star wikiPageWikiLinkText "visual double".
- Double_star wikiPageWikiLinkText "visual pair".
- Double_star wikiPageUsesTemplate Template:Convert.
- Double_star wikiPageUsesTemplate Template:Other_uses.
- Double_star wikiPageUsesTemplate Template:Reflist.
- Double_star wikiPageUsesTemplate Template:Stellar_system.