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- Pi1_Gruis abstract "Pi1 Gruis is a star in the constellation Grus. It is a semi-regular red giant of spectral type S5, ranging from apparent magnitude 5.31 to 7.01 over a period of 191 days, and is around 532 light-years from Earth. It is one of the brightest stars of a class of stars known as S Stars, and has a companion star of apparent magnitude 10.9 that is sunlike in properties—a yellow main sequence star of spectral type G0V. Separated by 2.71′′, the pair make up a likely binary system. The primary star has a measured diameter of 21 milliarcseconds, corresponding to a diameter 694 times that of the Sun. It is an ageing star, thought be well on its way transitioning from a red giant to a planetary nebula. A shell of material has been detected at a distance of 0.91 light-years (0.28 parsecs), which is estimated to have been ejected 21,000 years ago. Closer to the star, there appears to be a cavity within 200 AU, suggesting a drop off in the ejection of material in the past 90 years. The presence of one companion makes the shape of the shell irregular (rather than spherical), and there may as yet be another undetected companion contributing to this.The star was catalogued by French explorer and astronomer Nicolas Louis de Lacaille in 1756 but not given a name. Instead, he gave the Bayer designation of "Pi Gruis" to Pi2 Gruis. It was Thomas Brisbane who designated this star as Pi1. Annie Jump Cannon was the first to report its unusual spectrum, sending a plate of its spectrograph made in 1895 to Paul W. Merrill and noting its similarity to R Andromedae. Merrill selected these two stars along with R Cygni to be the three prototypes of the S Star class. Pi1 Gruis was one of the first 17 stars defined as S-stars by Merrill in 1922; the only star not observed from Mount Wilson due to its southerly location in the sky. Analysis of its spectrum showed bands indicating the presence of technetium, as well as oxides of zirconium, lanthanum, cerium and yttrium but not titanium nor barium (which have been recorded in other S stars).".
- Pi1_Gruis wikiPageID "41684133".
- Pi1_Gruis wikiPageLength "6191".
- Pi1_Gruis wikiPageOutDegree "34".
- Pi1_Gruis wikiPageRevisionID "648336957".
- Pi1_Gruis wikiPageWikiLink Annie_Jump_Cannon.
- Pi1_Gruis wikiPageWikiLink Apparent_magnitude.
- Pi1_Gruis wikiPageWikiLink Barium.
- Pi1_Gruis wikiPageWikiLink Bayer_designation.
- Pi1_Gruis wikiPageWikiLink Bright_Star_Catalogue.
- Pi1_Gruis wikiPageWikiLink Category:Bayer_objects.
- Pi1_Gruis wikiPageWikiLink Category:G-type_main-sequence_stars.
- Pi1_Gruis wikiPageWikiLink Category:Grus_(constellation).
- Pi1_Gruis wikiPageWikiLink Category:S-type_stars.
- Pi1_Gruis wikiPageWikiLink Cerium.
- Pi1_Gruis wikiPageWikiLink Constellation.
- Pi1_Gruis wikiPageWikiLink Grus_(constellation).
- Pi1_Gruis wikiPageWikiLink Harvard_Revised_catalogue.
- Pi1_Gruis wikiPageWikiLink Henry_Draper_Catalogue.
- Pi1_Gruis wikiPageWikiLink Henry_Draper_catalogue.
- Pi1_Gruis wikiPageWikiLink Hipparcos.
- Pi1_Gruis wikiPageWikiLink Lanthanum.
- Pi1_Gruis wikiPageWikiLink Light-year.
- Pi1_Gruis wikiPageWikiLink Nicolas_Louis_de_Lacaille.
- Pi1_Gruis wikiPageWikiLink Paul_W._Merrill.
- Pi1_Gruis wikiPageWikiLink Pi2_Gruis.
- Pi1_Gruis wikiPageWikiLink Planetary_nebula.
- Pi1_Gruis wikiPageWikiLink R_Andromedae.
- Pi1_Gruis wikiPageWikiLink R_Cygni.
- Pi1_Gruis wikiPageWikiLink Red_giant.
- Pi1_Gruis wikiPageWikiLink S-type_star.
- Pi1_Gruis wikiPageWikiLink Semi-regular_variable.
- Pi1_Gruis wikiPageWikiLink Semiregular_variable_star.
- Pi1_Gruis wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
- Pi1_Gruis wikiPageWikiLink Star.
- Pi1_Gruis wikiPageWikiLink Technetium.
- Pi1_Gruis wikiPageWikiLink Thomas_Brisbane.
- Pi1_Gruis wikiPageWikiLink Titanium.
- Pi1_Gruis wikiPageWikiLink Yttrium.
- Pi1_Gruis wikiPageWikiLink Zirconium.
- Pi1_Gruis absmagV "-".
- Pi1_Gruis appmagV "6.14".
- Pi1_Gruis class "S5, G0V".
- Pi1_Gruis constell Grus_(constellation).
- Pi1_Gruis epoch "J2000".
- Pi1_Gruis hasPhotoCollection Pi1_Gruis.
- Pi1_Gruis pError "0.76".
- Pi1_Gruis parallax "6.13".
- Pi1_Gruis variable Semi-regular_variable.
- Pi1_Gruis variable Semiregular_variable_star.
- Pi1_Gruis wikiPageUsesTemplate Template:Reflist.
- Pi1_Gruis wikiPageUsesTemplate Template:Starbox_astrometry.
- Pi1_Gruis wikiPageUsesTemplate Template:Starbox_begin.
- Pi1_Gruis wikiPageUsesTemplate Template:Starbox_catalog.
- Pi1_Gruis wikiPageUsesTemplate Template:Starbox_character.
- Pi1_Gruis wikiPageUsesTemplate Template:Starbox_end.
- Pi1_Gruis wikiPageUsesTemplate Template:Starbox_observe.
- Pi1_Gruis wikiPageUsesTemplate Template:Stars_of_Grus.
- Pi1_Gruis subject Category:Bayer_objects.
- Pi1_Gruis subject Category:G-type_main-sequence_stars.
- Pi1_Gruis subject Category:Grus_(constellation).
- Pi1_Gruis subject Category:S-type_stars.
- Pi1_Gruis hypernym Star.
- Pi1_Gruis type CelestialBody.
- Pi1_Gruis type Place.
- Pi1_Gruis type Star.
- Pi1_Gruis type Location.
- Pi1_Gruis type Place.
- Pi1_Gruis type Thing.
- Pi1_Gruis comment "Pi1 Gruis is a star in the constellation Grus. It is a semi-regular red giant of spectral type S5, ranging from apparent magnitude 5.31 to 7.01 over a period of 191 days, and is around 532 light-years from Earth. It is one of the brightest stars of a class of stars known as S Stars, and has a companion star of apparent magnitude 10.9 that is sunlike in properties—a yellow main sequence star of spectral type G0V. Separated by 2.71′′, the pair make up a likely binary system.".
- Pi1_Gruis label "Pi1 Gruis".
- Pi1_Gruis sameAs Pi1_Gruis.
- Pi1_Gruis sameAs Pi1_Gruis.
- Pi1_Gruis sameAs Pi1_Gruis.
- Pi1_Gruis sameAs m.0_fmh8_.
- Pi1_Gruis sameAs Q9291562.
- Pi1_Gruis sameAs Q9291562.
- Pi1_Gruis sameAs 天鹤座π¹.
- Pi1_Gruis wasDerivedFrom Pi1_Gruis?oldid=648336957.
- Pi1_Gruis isPrimaryTopicOf Pi1_Gruis.
- Pi1_Gruis name "Pi1 Gruis".