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- Eta_Sagittarii abstract "Eta Sagittarii (Eta Sgr, η Sagittarii, η Sgr) is a binary star system in the southern zodiac constellation of Sagittarius. Based upon parallax measurements, it is located at a distance of 146 light-years (45 parsecs) from Earth. It was formerly known as \"Beta Telescopii\" (β Tel). In India, where part of the constellation of Sagittarius represents an Elephant, this star forms the creature's tail.The primary component, η Sagittarii A, is a red giant star with a stellar classification of M2 III. It is an evolved star that is currently at a stage called the asymptotic giant branch, having exhausted both the hydrogen and the helium at its core. This star is classified as an oxygen-rich irregular variable, as it undergoes small magnitude fluctuations between +3.08 and 3.12. The measured angular diameter of this star is 11.9 ± 2.1 mas. At the estimated distance of Eta Draconis, this yields a physical size of about 57 times the radius of the Sun.The companion, η Sagittarii B, was first noted by American astronomer S. W. Burnham in 1879. The two stars share a common proper motion and hence are probably gravitationally bound to each other. The secondary is likely an F-type main sequence star with an apparent magnitude of +7.77. It located at an angular separation of 3.6 arcseconds from the primary, along a position angle of 108°. This star is at a projected distance of 165 Astronomical Units from the red giant primary and the pair take a minimum of 1,270 years to complete an orbit.Within the context of the Milky Way galaxy, this system is a member of the faint old disk group. Because of proper motion, this star will move into constellation Corona Australis around 6300 CE. Eta Sagittarii has two optical companions that are not physically associated with the system. The first is a 10th magnitude star at an angular separation of 93 arcseconds with a position angle of 303°. There is a fainter, 13th magnitude star at an angular separation of 33 arcseconds along a position angle of 276°.".
- Eta_Sagittarii thumbnail Sagittarius_IAU.svg?width=300.
- Eta_Sagittarii wikiPageID "2645765".
- Eta_Sagittarii wikiPageLength "11830".
- Eta_Sagittarii wikiPageOutDegree "60".
- Eta_Sagittarii wikiPageRevisionID "707171476".
- Eta_Sagittarii wikiPageWikiLink Al_Achsasi_al_Mouakket.
- Eta_Sagittarii wikiPageWikiLink Angular_diameter.
- Eta_Sagittarii wikiPageWikiLink Angular_distance.
- Eta_Sagittarii wikiPageWikiLink Apparent_magnitude.
- Eta_Sagittarii wikiPageWikiLink Astronomical_unit.
- Eta_Sagittarii wikiPageWikiLink Asymptotic_giant_branch.
- Eta_Sagittarii wikiPageWikiLink Binary_star.
- Eta_Sagittarii wikiPageWikiLink Boss_General_Catalogue.
- Eta_Sagittarii wikiPageWikiLink Bright_Star_Catalogue.
- Eta_Sagittarii wikiPageWikiLink Catalog_of_Components_of_Double_and_Multiple_Stars.
- Eta_Sagittarii wikiPageWikiLink Catalogues_of_Fundamental_Stars.
- Eta_Sagittarii wikiPageWikiLink Category:Bayer_objects.
- Eta_Sagittarii wikiPageWikiLink Category:F-type_main-sequence_stars.
- Eta_Sagittarii wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
- Eta_Sagittarii wikiPageWikiLink Category:Hipparcos_objects.
- Eta_Sagittarii wikiPageWikiLink Category:Irregular_variables.
- Eta_Sagittarii wikiPageWikiLink Category:M-type_giants.
- Eta_Sagittarii wikiPageWikiLink Category:Multiple_star_systems.
- Eta_Sagittarii wikiPageWikiLink Category:Sagittarius_(constellation).
- Eta_Sagittarii wikiPageWikiLink Chinese_language.
- Eta_Sagittarii wikiPageWikiLink Constellation.
- Eta_Sagittarii wikiPageWikiLink Corona_Australis.
- Eta_Sagittarii wikiPageWikiLink Delta_Sagittarii.
- Eta_Sagittarii wikiPageWikiLink Durchmusterung.
- Eta_Sagittarii wikiPageWikiLink Earth.
- Eta_Sagittarii wikiPageWikiLink Epsilon_Sagittarii.
- Eta_Sagittarii wikiPageWikiLink F-type_main-sequence_star.
- Eta_Sagittarii wikiPageWikiLink Gamma_Sagittarii.
- Eta_Sagittarii wikiPageWikiLink Glossary_of_astronomy.
- Eta_Sagittarii wikiPageWikiLink Henry_Draper_Catalogue.
- Eta_Sagittarii wikiPageWikiLink Hipparcos.
- Eta_Sagittarii wikiPageWikiLink Index_Catalogue_of_Visual_Double_Stars.
- Eta_Sagittarii wikiPageWikiLink Irregular_variable.
- Eta_Sagittarii wikiPageWikiLink Milky_Way.
- Eta_Sagittarii wikiPageWikiLink Minute_and_second_of_arc.
- Eta_Sagittarii wikiPageWikiLink Orbit.
- Eta_Sagittarii wikiPageWikiLink PPM_Star_Catalogue.
- Eta_Sagittarii wikiPageWikiLink Parallax.
- Eta_Sagittarii wikiPageWikiLink Position_angle.
- Eta_Sagittarii wikiPageWikiLink Proper_motion.
- Eta_Sagittarii wikiPageWikiLink Red_giant.
- Eta_Sagittarii wikiPageWikiLink Sagittarius_(constellation).
- Eta_Sagittarii wikiPageWikiLink Sherburne_Wesley_Burnham.
- Eta_Sagittarii wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
- Eta_Sagittarii wikiPageWikiLink Solar_radius.
- Eta_Sagittarii wikiPageWikiLink Stellar_classification.
- Eta_Sagittarii wikiPageWikiLink Stellar_evolution.
- Eta_Sagittarii wikiPageWikiLink Washington_Double_Star_Catalog.
- Eta_Sagittarii wikiPageWikiLink Winnowing_Basket_(Chinese_constellation).
- Eta_Sagittarii wikiPageWikiLink Zodiac.
- Eta_Sagittarii wikiPageWikiLink File:Cercle_rouge_100%25.svg.
- Eta_Sagittarii wikiPageWikiLink File:Sagittarius_IAU.svg.
- Eta_Sagittarii wikiPageWikiLinkText "Eta Sagittarii".
- Eta_Sagittarii wikiPageWikiLinkText "η Sagittarii".
- Eta_Sagittarii wikiPageWikiLinkText "η Sgr".
- Eta_Sagittarii absmagV "−4.90".
- Eta_Sagittarii appmagV "+3.11/+7.8".
- Eta_Sagittarii bV "+1.56".
- Eta_Sagittarii class "M2 III + F7 V".
- Eta_Sagittarii component "η Sgr A".
- Eta_Sagittarii constell Sagittarius_(constellation).
- Eta_Sagittarii epoch "J2000".
- Eta_Sagittarii pError "0.24".
- Eta_Sagittarii parallax "22.35".
- Eta_Sagittarii propMoDec "−166.26".
- Eta_Sagittarii propMoRa "−129.56".
- Eta_Sagittarii radialV "+0.5".
- Eta_Sagittarii radius "57".
- Eta_Sagittarii uB "+1.71".
- Eta_Sagittarii variable Irregular_variable.
- Eta_Sagittarii wikiPageUsesTemplate Template:Convert.
- Eta_Sagittarii wikiPageUsesTemplate Template:DEC.
- Eta_Sagittarii wikiPageUsesTemplate Template:Lang-en.
- Eta_Sagittarii wikiPageUsesTemplate Template:RA.
- Eta_Sagittarii wikiPageUsesTemplate Template:Reflist.
- Eta_Sagittarii wikiPageUsesTemplate Template:Starbox_astrometry.
- Eta_Sagittarii wikiPageUsesTemplate Template:Starbox_begin.
- Eta_Sagittarii wikiPageUsesTemplate Template:Starbox_catalog.
- Eta_Sagittarii wikiPageUsesTemplate Template:Starbox_character.
- Eta_Sagittarii wikiPageUsesTemplate Template:Starbox_detail.
- Eta_Sagittarii wikiPageUsesTemplate Template:Starbox_end.
- Eta_Sagittarii wikiPageUsesTemplate Template:Starbox_image.
- Eta_Sagittarii wikiPageUsesTemplate Template:Starbox_observe.
- Eta_Sagittarii wikiPageUsesTemplate Template:Stars_of_Sagittarius.
- Eta_Sagittarii subject Category:Bayer_objects.
- Eta_Sagittarii subject Category:F-type_main-sequence_stars.
- Eta_Sagittarii subject Category:Henry_Draper_Catalogue_objects.
- Eta_Sagittarii subject Category:Hipparcos_objects.
- Eta_Sagittarii subject Category:Irregular_variables.
- Eta_Sagittarii subject Category:M-type_giants.
- Eta_Sagittarii subject Category:Multiple_star_systems.
- Eta_Sagittarii subject Category:Sagittarius_(constellation).
- Eta_Sagittarii hypernym System.
- Eta_Sagittarii type CelestialBody.