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- Eta_Boötis abstract "Eta Boötis (η Boo, η Boötis) is a star in the constellation Boötes. It has the traditional names Muphrid and Saak, and the Flamsteed designation 8 Boötis. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.The name Muphrid is from the Arabic مفرد الرامح mufrid ar-rāmiħ "the (single) one of the lancer". In Chinese, 右攝提 (Yòu Niè Dī), meaning "the Right Conductor", refers to an asterism consisting of Eta Boötis, Tau Boötis and Upsilon Boötis. Consequently, Eta Boötis itself is known as 右攝提一 (Yòu Niè Dī yī, English: "the First Star of the Right Conductor"). In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Ramih al Ramih (رمح الرامح—rumḥ al rāmiḥ), which was translated into Latin as Lancea Lanceator, possibly meaning the lance of the lancer.This star is a subgiant that has begun the process of evolving from a main sequence star into a red giant. It has about 1.7 times the mass of the Sun and 2.7 times the Sun's radius. The estimated age of this star is about 2.7 billion years. Based on its spectra, Eta Boötis has a significant excess of elements heavier than helium. In fact the ratio of iron to hydrogen is considered close to the upper limit for dwarf stars in the galactic disk. The star is a suspected spectroscopic binary with a reported period of 494 days, but the companion was not confirmed through speckle interferometry. This measurement does not rule out a low mass stellar companion of spectral class M7.Eta Boötis appears close to the prominent star Arcturus (Alpha Bootis) in Earth's sky, and Arcturus is in fact its closest stellar neighbor, as both stars are nearly identical in distance from the Sun. The two stars are about 3.24 light years apart, and each would appear bright in the other's sky. Arcturus would appear as roughly magnitude -5.2 (about 120 times brighter than it appears from Earth, or close to twice the brightness of Venus) in the night sky of a hypothetical planet orbiting Eta Boötis, while Eta Boötis would appear at about magnitude -2.5 in the sky of a hypothetical planet orbiting Arcturus, or over twice the brightness of Sirius in our night sky.".
- Eta_Boötis thumbnail Boötes_IAU.svg?width=300.
- Eta_Boötis wikiPageExternalLink AladinPreview?-c=13+54+41.0787%2B18+23+51.781&ident=NSV+19993&submit=Aladin+previewer.
- Eta_Boötis wikiPageExternalLink VizieR-S?CCDM%20J13547%2b1824A.
- Eta_Boötis wikiPageExternalLink VizieR-S?GJ%20534.
- Eta_Boötis wikiPageExternalLink muphrid.html.
- Eta_Boötis wikiPageExternalLink stars.htm.
- Eta_Boötis wikiPageID "2903315".
- Eta_Boötis wikiPageLength "9867".
- Eta_Boötis wikiPageOutDegree "46".
- Eta_Boötis wikiPageRevisionID "653381072".
- Eta_Boötis wikiPageWikiLink Al_Achsasi_al_Mouakket.
- Eta_Boötis wikiPageWikiLink Arcturus.
- Eta_Boötis wikiPageWikiLink Asterism_(astronomy).
- Eta_Boötis wikiPageWikiLink Binary_star.
- Eta_Boötis wikiPageWikiLink Bonner_Durchmusterung.
- Eta_Boötis wikiPageWikiLink Boötes.
- Eta_Boötis wikiPageWikiLink Bright_Star_Catalogue.
- Eta_Boötis wikiPageWikiLink Category:Bayer_objects.
- Eta_Boötis wikiPageWikiLink Category:Binary_stars.
- Eta_Boötis wikiPageWikiLink Category:Boötes_(constellation).
- Eta_Boötis wikiPageWikiLink Category:Flamsteed_objects.
- Eta_Boötis wikiPageWikiLink Category:G-type_subgiants.
- Eta_Boötis wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
- Eta_Boötis wikiPageWikiLink Category:Hipparcos_objects.
- Eta_Boötis wikiPageWikiLink Category:Solar-type_stars.
- Eta_Boötis wikiPageWikiLink Category:Spectroscopic_binaries.
- Eta_Boötis wikiPageWikiLink Category:Stars_with_proper_names.
- Eta_Boötis wikiPageWikiLink Chinese_language.
- Eta_Boötis wikiPageWikiLink Constellation.
- Eta_Boötis wikiPageWikiLink Disc_(galaxy).
- Eta_Boötis wikiPageWikiLink Durchmusterung.
- Eta_Boötis wikiPageWikiLink Dwarf_star.
- Eta_Boötis wikiPageWikiLink Flamsteed_designation.
- Eta_Boötis wikiPageWikiLink Galactic_disk.
- Eta_Boötis wikiPageWikiLink General_Catalogue_of_Trigonometric_Parallaxes.
- Eta_Boötis wikiPageWikiLink Harvard_Revised_catalogue.
- Eta_Boötis wikiPageWikiLink Helium.
- Eta_Boötis wikiPageWikiLink Henry_Draper_Catalogue.
- Eta_Boötis wikiPageWikiLink Henry_Draper_catalogue.
- Eta_Boötis wikiPageWikiLink Henry_L._Giclas_catalogue.
- Eta_Boötis wikiPageWikiLink Hipparcos.
- Eta_Boötis wikiPageWikiLink Hipparcos_catalogue.
- Eta_Boötis wikiPageWikiLink Iron.
- Eta_Boötis wikiPageWikiLink Latin.
- Eta_Boötis wikiPageWikiLink List_of_nearest_stars_and_brown_dwarfs.
- Eta_Boötis wikiPageWikiLink List_of_the_nearest_stars.
- Eta_Boötis wikiPageWikiLink Luyten_Two-Tenths_catalogue.
- Eta_Boötis wikiPageWikiLink Main_sequence.
- Eta_Boötis wikiPageWikiLink Neck_(Chinese_constellation).
- Eta_Boötis wikiPageWikiLink Red_giant.
- Eta_Boötis wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
- Eta_Boötis wikiPageWikiLink Solar_mass.
- Eta_Boötis wikiPageWikiLink Solar_radius.
- Eta_Boötis wikiPageWikiLink Speckle_imaging.
- Eta_Boötis wikiPageWikiLink Speckle_interferometry.
- Eta_Boötis wikiPageWikiLink Spectroscopic_binary.
- Eta_Boötis wikiPageWikiLink Spectrum.
- Eta_Boötis wikiPageWikiLink Star_catalogue.
- Eta_Boötis wikiPageWikiLink Stars_and_planetary_systems_in_fiction.
- Eta_Boötis wikiPageWikiLink Subgiant.
- Eta_Boötis wikiPageWikiLink Tau_Boötis.
- Eta_Boötis wikiPageWikiLink Upsilon_Boötis.
- Eta_Boötis wikiPageWikiLink File:Boötes_IAU.svg.
- Eta_Boötis wikiPageWikiLink File:Cercle_rouge_100%25.svg.
- Eta_Boötis wikiPageWikiLinkText "Eta Boötis".
- Eta_Boötis wikiPageWikiLinkText "Mufrid".
- Eta_Boötis wikiPageWikiLinkText "Muphrid".
- Eta_Boötis wikiPageWikiLinkText "η Boo".
- Eta_Boötis wikiPageWikiLinkText "η Boötis".
- Eta_Boötis absmagV "2.41".
- Eta_Boötis ageGyr "2.7".
- Eta_Boötis appmagV "2.68".
- Eta_Boötis bV "+0.585".
- Eta_Boötis class "G0 IV".
- Eta_Boötis constell Boötes.
- Eta_Boötis epoch "J2000".
- Eta_Boötis gravity "3.817".
- Eta_Boötis hasPhotoCollection Eta_Boötis.
- Eta_Boötis luminosity "8.89".
- Eta_Boötis mass "1.71".
- Eta_Boötis metalFe "0.27".
- Eta_Boötis pError "1.24".
- Eta_Boötis parallax "87.75".
- Eta_Boötis propMoDec "-356.29".
- Eta_Boötis propMoRa "-60.95".
- Eta_Boötis rI "0.2".
- Eta_Boötis radialV "-1.6".
- Eta_Boötis radius "2.672".
- Eta_Boötis rotationalVelocity "11.8".
- Eta_Boötis temperature "6100".
- Eta_Boötis uB "+0.207".
- Eta_Boötis wikiPageUsesTemplate Template:Citation_needed.
- Eta_Boötis wikiPageUsesTemplate Template:Lang-en.
- Eta_Boötis wikiPageUsesTemplate Template:Nearest_bright_star_systems.
- Eta_Boötis wikiPageUsesTemplate Template:Reflist.
- Eta_Boötis wikiPageUsesTemplate Template:Starbox_astrometry.
- Eta_Boötis wikiPageUsesTemplate Template:Starbox_begin.
- Eta_Boötis wikiPageUsesTemplate Template:Starbox_catalog.
- Eta_Boötis wikiPageUsesTemplate Template:Starbox_character.