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- RY_Sagittarii abstract "RY Sagittarii is an orange supergiant and an R Coronae Borealis type variable star in the constellation Sagittarius. Although it ostensibly has the spectrum of a G-type star, it differs markedly from most in that it has almost no hydrogen and a lot of carbon. The star is so remote that its parallax, distance and hence luminosity were impossible to calculate with any accuracy. The Hipparcos satellite calculated its parallax at 1.29 milliarcseconds, yielding a distance of 1,716.6 light-years (526.32 parsecs) from Earth. Its effective temperature has been calculated at 7250 K.It is one of the three brightest R Coronae Borealis stars visible to Earth observers, along with R Coronae Borealis and V854 Centauri. It is also a pulsating variable, with a semiregular period of 38 days. Its light curve has been studied for over a hundred years and is typical for the class, characterised by a sudden drop in brightness of several magnitudes over a few weeks before gradually brightening over the following several months. The timing between these dimmings is irregular. The cause of the drop in magnitude is the presence of dust clouds of carbon obscuring (and most likely ejected from) the star, though the mechanism how this might occur is not known. Extensive clouds have been detected with ESO's Very Large Telescope Interferometer.Colonel Ernest Elliott Markwick first came across what became known as RY Sagittarii during searches for variable stars while posted in Gibraltar. He recorded it dimming from magnitude 7 in July 1893 to fainter than 11 by 23 October that year, and brightening to magnitude 6.4 by November 1894. Edward Charles Pickering wrote that it was a \"remarkable object\", and \"nearly got away\". The spectrum was first noted to be peculiar at the time, and by 1953 it was classified as a R Coronae Borealis variable, along with a handful of other stars.Mystified by its origins, Danziger postulated possible explanations as forming from a helium cloud, an aged star that had exhausted its hydrogen, or a star that had somehow thrown off its hydrogen envelope, though noted there was no evidence of such an envelope. He conceded that knowledge of star evolution was not advanced enough to come up with an explanation.".
- RY_Sagittarii wikiPageID "40193459".
- RY_Sagittarii wikiPageLength "7558".
- RY_Sagittarii wikiPageOutDegree "24".
- RY_Sagittarii wikiPageRevisionID "680334186".
- RY_Sagittarii wikiPageWikiLink Bright_Star_Catalogue.
- RY_Sagittarii wikiPageWikiLink Category:HR_objects.
- RY_Sagittarii wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
- RY_Sagittarii wikiPageWikiLink Category:Objects_named_with_variable_star_designations.
- RY_Sagittarii wikiPageWikiLink Category:R_Coronae_Borealis_variables.
- RY_Sagittarii wikiPageWikiLink Category:Sagittarius_(constellation).
- RY_Sagittarii wikiPageWikiLink Constellation.
- RY_Sagittarii wikiPageWikiLink Earth.
- RY_Sagittarii wikiPageWikiLink Edward_Charles_Pickering.
- RY_Sagittarii wikiPageWikiLink Epoch_(astronomy).
- RY_Sagittarii wikiPageWikiLink Ernest_Elliott_Markwick.
- RY_Sagittarii wikiPageWikiLink Henry_Draper_Catalogue.
- RY_Sagittarii wikiPageWikiLink Hipparcos.
- RY_Sagittarii wikiPageWikiLink International_Celestial_Reference_System.
- RY_Sagittarii wikiPageWikiLink R_Coronae_Borealis.
- RY_Sagittarii wikiPageWikiLink R_Coronae_Borealis_variable.
- RY_Sagittarii wikiPageWikiLink Sagittarius_(constellation).
- RY_Sagittarii wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
- RY_Sagittarii wikiPageWikiLink Supergiant.
- RY_Sagittarii wikiPageWikiLink V854_Centauri.
- RY_Sagittarii wikiPageWikiLink Variable_star.
- RY_Sagittarii wikiPageWikiLinkText "RY Sagittarii".
- RY_Sagittarii wikiPageWikiLinkText "RY Sgr".
- RY_Sagittarii absmagV "-5.64".
- RY_Sagittarii appmagV "5.8".
- RY_Sagittarii class "G0Iaep".
- RY_Sagittarii constell Sagittarius_(constellation).
- RY_Sagittarii distLy "9049".
- RY_Sagittarii epoch Epoch_(astronomy).
- RY_Sagittarii epoch International_Celestial_Reference_System.
- RY_Sagittarii parallax "1.29".
- RY_Sagittarii propMoDec "-0.41".
- RY_Sagittarii propMoRa "10.33".
- RY_Sagittarii radialV "-23".
- RY_Sagittarii variable R_Coronae_Borealis_variable.
- RY_Sagittarii wikiPageUsesTemplate Template:Convert.
- RY_Sagittarii wikiPageUsesTemplate Template:DEC.
- RY_Sagittarii wikiPageUsesTemplate Template:RA.
- RY_Sagittarii wikiPageUsesTemplate Template:Reflist.
- RY_Sagittarii wikiPageUsesTemplate Template:Starbox_astrometry.
- RY_Sagittarii wikiPageUsesTemplate Template:Starbox_begin.
- RY_Sagittarii wikiPageUsesTemplate Template:Starbox_catalog.
- RY_Sagittarii wikiPageUsesTemplate Template:Starbox_character.
- RY_Sagittarii wikiPageUsesTemplate Template:Starbox_detail.
- RY_Sagittarii wikiPageUsesTemplate Template:Starbox_end.
- RY_Sagittarii wikiPageUsesTemplate Template:Starbox_observe.
- RY_Sagittarii wikiPageUsesTemplate Template:Stars_of_Sagittarius.
- RY_Sagittarii subject Category:HR_objects.
- RY_Sagittarii subject Category:Henry_Draper_Catalogue_objects.
- RY_Sagittarii subject Category:Objects_named_with_variable_star_designations.
- RY_Sagittarii subject Category:R_Coronae_Borealis_variables.
- RY_Sagittarii subject Category:Sagittarius_(constellation).
- RY_Sagittarii hypernym Supergiant.
- RY_Sagittarii type CelestialBody.
- RY_Sagittarii type Place.
- RY_Sagittarii type Star.
- RY_Sagittarii type Location.
- RY_Sagittarii type Place.
- RY_Sagittarii type Thing.
- RY_Sagittarii comment "RY Sagittarii is an orange supergiant and an R Coronae Borealis type variable star in the constellation Sagittarius. Although it ostensibly has the spectrum of a G-type star, it differs markedly from most in that it has almost no hydrogen and a lot of carbon. The star is so remote that its parallax, distance and hence luminosity were impossible to calculate with any accuracy.".
- RY_Sagittarii label "RY Sagittarii".
- RY_Sagittarii sameAs Q6095882.
- RY_Sagittarii sameAs RY_Sagittarii.
- RY_Sagittarii sameAs RY_Sagittarii.
- RY_Sagittarii sameAs m.0wxvccf.
- RY_Sagittarii sameAs RY_Sagittarii.
- RY_Sagittarii sameAs Q6095882.
- RY_Sagittarii sameAs 人馬座RY.
- RY_Sagittarii wasDerivedFrom RY_Sagittarii?oldid=680334186.
- RY_Sagittarii isPrimaryTopicOf RY_Sagittarii.
- RY_Sagittarii name "RY Sagittarii".