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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 wikiPageRevisionID "602282644".
- 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 hasPhotoCollection Pi_Hydrae.
- 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 subject Category:Bayer_objects.
- Pi_Hydrae subject Category:Hydra_(constellation).
- Pi_Hydrae type BayerObjects.
- Pi_Hydrae type Object100002684.
- Pi_Hydrae type PhysicalEntity100001930.
- Pi_Hydrae type CelestialBody.
- Pi_Hydrae type Star.
- Pi_Hydrae type PhysicalBody.
- 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 label "Pi Hydrae".
- Pi_Hydrae label "Pi Hydrae".
- Pi_Hydrae label "Pi Hydrae".
- Pi_Hydrae label "Pi Hydrae".
- Pi_Hydrae label "平二".
- 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 Pi_Hydrae.
- Pi_Hydrae sameAs m.026dfpx.
- Pi_Hydrae sameAs Q978492.
- Pi_Hydrae sameAs Q978492.
- Pi_Hydrae sameAs Pi_Hydrae.
- Pi_Hydrae wasDerivedFrom Pi_Hydrae?oldid=602282644.
- Pi_Hydrae depiction Hydra_IAU.svg.
- Pi_Hydrae isPrimaryTopicOf Pi_Hydrae.
- Pi_Hydrae name "Pi Hydrae".