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- Q1747586 subject Q10663.
- Q1747586 subject Q7465903.
- Q1747586 subject Q8284770.
- Q1747586 subject Q8393112.
- Q1747586 subject Q8395318.
- Q1747586 subject Q8641743.
- Q1747586 subject Q8691170.
- Q1747586 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).".
- Q1747586 thumbnail U_Gem_aavso.png?width=300.
- Q1747586 wikiPageExternalLink vsp.
- Q1747586 wikiPageExternalLink ql.
- Q1747586 wikiPageExternalLink 0299.pdf.
- Q1747586 wikiPageExternalLink UGem.
- Q1747586 wikiPageWikiLink Q1059564.
- Q1747586 wikiPageWikiLink Q10663.
- Q1747586 wikiPageWikiLink Q1205564.
- Q1747586 wikiPageWikiLink Q124313.
- Q1747586 wikiPageWikiLink Q14267.
- Q1747586 wikiPageWikiLink Q237604.
- Q1747586 wikiPageWikiLink Q244264.
- Q1747586 wikiPageWikiLink Q2703.
- Q1747586 wikiPageWikiLink Q310479.
- Q1747586 wikiPageWikiLink Q50053.
- Q1747586 wikiPageWikiLink Q5871.
- Q1747586 wikiPageWikiLink Q5893.
- Q1747586 wikiPageWikiLink Q675076.
- Q1747586 wikiPageWikiLink Q7465903.
- Q1747586 wikiPageWikiLink Q8284770.
- Q1747586 wikiPageWikiLink Q8393112.
- Q1747586 wikiPageWikiLink Q8395318.
- Q1747586 wikiPageWikiLink Q8641743.
- Q1747586 wikiPageWikiLink Q8691170.
- Q1747586 wikiPageWikiLink Q8923.
- Q1747586 wikiPageWikiLink Q8928.
- Q1747586 wikiPageWikiLink Q948944.
- Q1747586 type Place.
- Q1747586 type CelestialBody.
- Q1747586 type Location.
- Q1747586 type Place.
- Q1747586 type Star.
- Q1747586 type Thing.
- Q1747586 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.".
- Q1747586 label "U Geminorum".
- Q1747586 depiction U_Gem_aavso.png.
- Q1747586 name "U Geminorum".