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- 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 ql.
- U_Geminorum wikiPageExternalLink vsp.
- U_Geminorum wikiPageExternalLink 0299.pdf.
- U_Geminorum wikiPageExternalLink UGem.
- U_Geminorum wikiPageID "5208184".
- U_Geminorum wikiPageRevisionID "602285675".
- 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 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 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 type CelestialBody109239740.
- U_Geminorum type DwarfNovae.
- U_Geminorum type M-typeMainSequenceStars.
- U_Geminorum type NaturalObject100019128.
- U_Geminorum type Nova109374493.
- U_Geminorum type Object100002684.
- U_Geminorum type ObjectsNamedWithVariableStarDesignations.
- U_Geminorum type PhysicalEntity100001930.
- U_Geminorum type Star109444100.
- U_Geminorum type VariableStar109469152.
- U_Geminorum type VariableStars.
- U_Geminorum type Whole100003553.
- U_Geminorum type CelestialBody.
- U_Geminorum type Star.
- U_Geminorum type PhysicalBody.
- 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 label "U Geminorum".
- U_Geminorum label "U Geminorum".
- U_Geminorum label "U Geminorum".
- U_Geminorum label "U Geminorum".
- U_Geminorum label "U Близнецов".
- U_Geminorum label "雙子座U".
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum sameAs m.0d7x84.
- U_Geminorum sameAs Q1747586.
- U_Geminorum sameAs Q1747586.
- U_Geminorum sameAs U_Geminorum.
- U_Geminorum wasDerivedFrom U_Geminorum?oldid=602285675.
- U_Geminorum depiction U_Gem_aavso.png.
- U_Geminorum isPrimaryTopicOf U_Geminorum.
- U_Geminorum name "U Geminorum".