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- Pi_Hydrae abstract "Pi Hydrae (π Hya, π Hydrae) is a star in the constellation Hydra with an apparent visual magnitude of 3.3, making it visible to the naked eye. Parallax measurements put this star at a distance of about 101 light-years (31 parsecs) from the Earth.The spectrum of this star shows it to have a stellar classification of K1 III-IV, with the luminosity class of 'III-IV' suggesting it is in an evolutionary transition stage somewhere between a subgiant and a giant star. It has a low projected rotational velocity of 2.25 km s−1. Pi Hydrae is radiating energy from its outer envelope with an effective temperature of 4,670 K, giving it the orange hue of a K-type star.Pi Hydrae is a type of giant known as a cyanogen-weak star, which means that its spectrum displays weak absorption lines of CN− relative to the metallicity. (The last is a term astronomers use when describing the abundance of elements other than hydrogen and helium.) Otherwise, it appears to be a normal star of its evolutionary class, having undergone first dredge-up of nuclear fusion by-products onto its surface layers. The measured angular diameter of this star, after correction for limb darkening, is 3.76 ± 0.04 mas. At its estimated distance, this yields a physical size of about 12–13 times the radius of the Sun. It has an estimated mass of 2.45 times the mass of the Sun.".
- Pi_Hydrae thumbnail Hydra_IAU.svg?width=300.
- Pi_Hydrae wikiPageExternalLink pihya.html.
- Pi_Hydrae wikiPageID "7799949".
- Pi_Hydrae wikiPageLength "8521".
- Pi_Hydrae wikiPageOutDegree "33".
- Pi_Hydrae wikiPageRevisionID "654048628".
- Pi_Hydrae wikiPageWikiLink Angular_diameter.
- Pi_Hydrae wikiPageWikiLink Apparent_magnitude.
- Pi_Hydrae wikiPageWikiLink Bright_Star_Catalogue.
- Pi_Hydrae wikiPageWikiLink Catalogues_of_Fundamental_Stars.
- Pi_Hydrae wikiPageWikiLink Category:Bayer_objects.
- Pi_Hydrae wikiPageWikiLink Category:Hydra_(constellation).
- Pi_Hydrae wikiPageWikiLink Constellation.
- Pi_Hydrae wikiPageWikiLink Cyanogen.
- Pi_Hydrae wikiPageWikiLink Dredge-up.
- Pi_Hydrae wikiPageWikiLink Durchmusterung.
- Pi_Hydrae wikiPageWikiLink Effective_temperature.
- Pi_Hydrae wikiPageWikiLink Giant_star.
- Pi_Hydrae wikiPageWikiLink Henry_Draper_Catalogue.
- Pi_Hydrae wikiPageWikiLink Hipparcos.
- Pi_Hydrae wikiPageWikiLink Hydra_(constellation).
- Pi_Hydrae wikiPageWikiLink Limb_darkening.
- Pi_Hydrae wikiPageWikiLink Metallicity.
- Pi_Hydrae wikiPageWikiLink Minute_and_second_of_arc.
- Pi_Hydrae wikiPageWikiLink Nuclear_fusion.
- Pi_Hydrae wikiPageWikiLink Parallax.
- Pi_Hydrae wikiPageWikiLink Solar_mass.
- Pi_Hydrae wikiPageWikiLink Solar_radius.
- Pi_Hydrae wikiPageWikiLink Spectral_line.
- Pi_Hydrae wikiPageWikiLink Spectrum.
- Pi_Hydrae wikiPageWikiLink Star.
- Pi_Hydrae wikiPageWikiLink Stellar_classification.
- Pi_Hydrae wikiPageWikiLink Stellar_evolution.
- Pi_Hydrae wikiPageWikiLink Stellar_rotation.
- Pi_Hydrae wikiPageWikiLink Subgiant.
- Pi_Hydrae wikiPageWikiLink File:Cercle_rouge_100%25.svg.
- Pi_Hydrae wikiPageWikiLink File:Hydra_IAU.svg.
- Pi_Hydrae wikiPageWikiLinkText "Pi Hydrae".
- Pi_Hydrae wikiPageWikiLinkText "π Hya".
- Pi_Hydrae absmagV "0.79".
- Pi_Hydrae appmagV "3.25".
- Pi_Hydrae bV "+1.120".
- Pi_Hydrae class "K1 III–IV".
- Pi_Hydrae constell Hydra_(constellation).
- Pi_Hydrae epoch "J2000".
- Pi_Hydrae gravity "2.65".
- Pi_Hydrae mass "1.76".
- Pi_Hydrae metalFe "0.04".
- Pi_Hydrae pError "0.16".
- Pi_Hydrae parallax "32.3".
- Pi_Hydrae propMoDec "−141.18".
- Pi_Hydrae propMoRa "+43.70".
- Pi_Hydrae radialV "+26.7".
- Pi_Hydrae radius "12".
- Pi_Hydrae rotationalVelocity "2.25".
- Pi_Hydrae temperature "4670".
- Pi_Hydrae uB "+1.040".
- Pi_Hydrae wikiPageUsesTemplate Template:Citation.
- Pi_Hydrae wikiPageUsesTemplate Template:Convert.
- Pi_Hydrae wikiPageUsesTemplate Template:DEC.
- Pi_Hydrae wikiPageUsesTemplate Template:RA.
- Pi_Hydrae wikiPageUsesTemplate Template:Reflist.
- Pi_Hydrae wikiPageUsesTemplate Template:Starbox_astrometry.
- Pi_Hydrae wikiPageUsesTemplate Template:Starbox_begin.
- Pi_Hydrae wikiPageUsesTemplate Template:Starbox_catalog.
- Pi_Hydrae wikiPageUsesTemplate Template:Starbox_character.
- Pi_Hydrae wikiPageUsesTemplate Template:Starbox_detail.
- Pi_Hydrae wikiPageUsesTemplate Template:Starbox_end.
- Pi_Hydrae wikiPageUsesTemplate Template:Starbox_image.
- Pi_Hydrae wikiPageUsesTemplate Template:Starbox_observe.
- Pi_Hydrae wikiPageUsesTemplate Template:Stars_of_Hydra.
- Pi_Hydrae subject Category:Bayer_objects.
- Pi_Hydrae subject Category:Hydra_(constellation).
- Pi_Hydrae hypernym Star.
- Pi_Hydrae type CelestialBody.
- Pi_Hydrae type Place.
- Pi_Hydrae type Star.
- Pi_Hydrae type Catalogue.
- Pi_Hydrae type Location.
- Pi_Hydrae type Place.
- Pi_Hydrae type Thing.
- Pi_Hydrae comment "Pi Hydrae (π Hya, π Hydrae) is a star in the constellation Hydra with an apparent visual magnitude of 3.3, making it visible to the naked eye. Parallax measurements put this star at a distance of about 101 light-years (31 parsecs) from the Earth.The spectrum of this star shows it to have a stellar classification of K1 III-IV, with the luminosity class of 'III-IV' suggesting it is in an evolutionary transition stage somewhere between a subgiant and a giant star.".
- Pi_Hydrae label "Pi Hydrae".
- Pi_Hydrae sameAs Q978492.
- Pi_Hydrae sameAs Pi_Hydrae.
- Pi_Hydrae sameAs Pi_Hydrae.
- Pi_Hydrae sameAs پی_مار_باریک.
- Pi_Hydrae sameAs Pi_Hydrae.
- Pi_Hydrae sameAs Pi_Hydrae.
- Pi_Hydrae sameAs Pi_Hydrae.
- Pi_Hydrae sameAs Pi_Hydrae.
- Pi_Hydrae sameAs Pi_Hydrae.
- Pi_Hydrae sameAs m.026dfpx.
- Pi_Hydrae sameAs Q978492.
- Pi_Hydrae sameAs 平二.
- Pi_Hydrae wasDerivedFrom Pi_Hydrae?oldid=654048628.
- Pi_Hydrae depiction Hydra_IAU.svg.
- Pi_Hydrae isPrimaryTopicOf Pi_Hydrae.
- Pi_Hydrae name "Pi Hydrae".