Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/U_Geminorum> ?p ?o }
- U_Geminorum abstract "U Geminorum (U Gem), in the constellation Gemini, is an archetypal example of a dwarf nova. The binary star system consists of a white dwarf closely orbiting a red dwarf. Roughly every 100 days it undergoes an outburst that greatly increases its brightness. It was discovered by J.R. Hind in 1855 who initially thought it was a nova; it quickly faded below his telescope's limiting magnitude. Its true nature was revealed three months later when it was reobserved in outburst by Pogson. The star has been monitored by amateur and professional astronomers ever since, though its location near the zodiac means that some outbursts are undoubtedly missed due to the seasonal gap.The U Geminorum binary has a very short orbital period of 4 hours and 11 minutes; this orbit alone makes the system variable, as the components transit and eclipse each other with each revolution. Normally, the combined apparent magnitude varies between 14.0 and 15.1; during an outburst however, the star can brighten a hundredfold, to 9th magnitude. Though the average interval is 100 days, the period is in fact highly irregular, varying from as little as 62 days to as long as 257. As is the case with dwarf novae, the outbursts are theorized results of a periodic surge of influx from the white dwarf's accretion disk, caused by instability in the disk itself.Distance estimates for U Geminorum have varied from 52 parsecs (170 light-years) to 112 parsecs (370 light-years), with a best estimate of 82 parsecs (270 light-years).".
- U_Geminorum thumbnail U_Gem_aavso.png?width=300.
- U_Geminorum wikiPageExternalLink vsp.
- U_Geminorum wikiPageExternalLink ql.
- U_Geminorum wikiPageExternalLink 0299.pdf.
- U_Geminorum wikiPageExternalLink UGem.
- U_Geminorum wikiPageID "5208184".
- U_Geminorum wikiPageLength "5867".
- U_Geminorum wikiPageOutDegree "25".
- U_Geminorum wikiPageRevisionID "660785141".
- U_Geminorum wikiPageWikiLink AAVSO.
- U_Geminorum wikiPageWikiLink Accretion_disc.
- U_Geminorum wikiPageWikiLink Accretion_disk.
- U_Geminorum wikiPageWikiLink American_Association_of_Variable_Star_Observers.
- U_Geminorum wikiPageWikiLink Apparent_magnitude.
- U_Geminorum wikiPageWikiLink Binary_star.
- U_Geminorum wikiPageWikiLink Cataclysmic_variable_star.
- U_Geminorum wikiPageWikiLink Category:B-type_subdwarfs.
- U_Geminorum wikiPageWikiLink Category:Dwarf_novae.
- U_Geminorum wikiPageWikiLink Category:Gemini_(constellation).
- U_Geminorum wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
- U_Geminorum wikiPageWikiLink Category:M-type_main-sequence_stars.
- U_Geminorum wikiPageWikiLink Category:Objects_named_with_variable_star_designations.
- U_Geminorum wikiPageWikiLink Category:Variable_stars.
- U_Geminorum wikiPageWikiLink Constellation.
- U_Geminorum wikiPageWikiLink Dwarf_nova.
- U_Geminorum wikiPageWikiLink Epoch_(astronomy).
- U_Geminorum wikiPageWikiLink Gemini_(constellation).
- U_Geminorum wikiPageWikiLink J.R._Hind.
- U_Geminorum wikiPageWikiLink J2000.0.
- U_Geminorum wikiPageWikiLink John_Russell_Hind.
- U_Geminorum wikiPageWikiLink Julian_day.
- U_Geminorum wikiPageWikiLink Light_curve.
- U_Geminorum wikiPageWikiLink Photometric_system.
- U_Geminorum wikiPageWikiLink Red_dwarf.
- U_Geminorum wikiPageWikiLink White_dwarf.
- U_Geminorum wikiPageWikiLink File:U_Gem_aavso.png.
- U_Geminorum wikiPageWikiLinkText "U Gem".
- U_Geminorum wikiPageWikiLinkText "U Geminorum".
- U_Geminorum wikiPageWikiLinkText "UG".
- U_Geminorum absmagV "9.5".
- U_Geminorum appmagV "14.1".
- U_Geminorum class "sd:Be+ / M4.5Ve".
- U_Geminorum constell Gemini_(constellation).
- U_Geminorum epoch Epoch_(astronomy).
- U_Geminorum epoch J2000.0.
- U_Geminorum hasPhotoCollection U_Geminorum.
- U_Geminorum pError "5.4".
- U_Geminorum parallax "7.9".
- U_Geminorum propMoDec "-42.2".
- U_Geminorum propMoRa "-30".
- U_Geminorum radialV "+42.0".
- U_Geminorum variable Dwarf_nova.
- U_Geminorum wikiPageUsesTemplate Template:Citation.
- U_Geminorum wikiPageUsesTemplate Template:Convert.
- U_Geminorum wikiPageUsesTemplate Template:Multi-star-stub.
- U_Geminorum wikiPageUsesTemplate Template:Reflist.
- U_Geminorum wikiPageUsesTemplate Template:Starbox_astrometry.
- U_Geminorum wikiPageUsesTemplate Template:Starbox_begin.
- U_Geminorum wikiPageUsesTemplate Template:Starbox_catalog.
- U_Geminorum wikiPageUsesTemplate Template:Starbox_character.
- U_Geminorum wikiPageUsesTemplate Template:Starbox_end.
- U_Geminorum wikiPageUsesTemplate Template:Starbox_image.
- U_Geminorum wikiPageUsesTemplate Template:Starbox_observe.
- U_Geminorum wikiPageUsesTemplate Template:Stars_of_Gemini.
- U_Geminorum wikiPageUsesTemplate Template:Var-star-stub.
- U_Geminorum subject Category:B-type_subdwarfs.
- U_Geminorum subject Category:Dwarf_novae.
- U_Geminorum subject Category:Gemini_(constellation).
- U_Geminorum subject Category:Henry_Draper_Catalogue_objects.
- U_Geminorum subject Category:M-type_main-sequence_stars.
- U_Geminorum subject Category:Objects_named_with_variable_star_designations.
- U_Geminorum subject Category:Variable_stars.
- U_Geminorum hypernym Example.
- U_Geminorum type Article.
- U_Geminorum type Building.
- U_Geminorum type CelestialBody.
- U_Geminorum type Event.
- U_Geminorum type Place.
- U_Geminorum type Star.
- U_Geminorum type Article.
- U_Geminorum type Catalogue.
- U_Geminorum type Event.
- U_Geminorum type Location.
- U_Geminorum type Place.
- U_Geminorum type Thing.
- U_Geminorum comment "U Geminorum (U Gem), in the constellation Gemini, is an archetypal example of a dwarf nova. The binary star system consists of a white dwarf closely orbiting a red dwarf. Roughly every 100 days it undergoes an outburst that greatly increases its brightness. It was discovered by J.R. Hind in 1855 who initially thought it was a nova; it quickly faded below his telescope's limiting magnitude. Its true nature was revealed three months later when it was reobserved in outburst by Pogson.".
- U_Geminorum label "U Geminorum".
- U_Geminorum sameAs نجوم_U_التوأمين.
- U_Geminorum sameAs O_Geminorum.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs یو_دوپیکر.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs m.0d7x84.
- U_Geminorum sameAs U_Близнецов.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs Q1747586.