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- GY_Andromedae abstract "GY Andromedae (GY And) is an α2 Canum Venaticorum type variable star in the northern constellation Andromeda. Its brightness fluctuates in visual magnitude between 6.27m and 6.41m, making it a challenge to view with the naked eye even in good seeing conditions. The magnetic activity on this star shows an unusually long period of variability, cycling about once every 23 years. Based upon parallax measurements, this star is located at a distance of about 520 light-years (160 parsecs) from the Earth.This is classified as an Ap/Bp star, with a peculiar spectrum showing lines of chromium and europium that change in intensity over a period matching the variability cycle, although opposite in phase. Its most striking characteristic is the presence of the unstable element promethium in its emission spectrum. All isotopes of this element are radioactive with half lives of 17.7 years or less. The promethium in the outer envelope may be generated by the spontaneous fission of higher mass transuranic elements.In 1958, American astronomer Horace W. Babcock discovered that this is a spectroscopic binary star. It has an orbital period of 273 days with a large eccentricity of 0.47. The two components are separated by an estimated distance of at least 3.74 × 107 km, or 0.25 Astronomical Units.".
- GY_Andromedae wikiPageExternalLink AladinPreview?-c=01+38+31.8241%2B45+23+58.943&ident=V*+GY+And&submit=Aladin+previewer.
- GY_Andromedae wikiPageExternalLink gy-andromedae.jpg.
- GY_Andromedae wikiPageExternalLink gy-andromedae.shtml.
- GY_Andromedae wikiPageID "305538".
- GY_Andromedae wikiPageRevisionID "591561675".
- GY_Andromedae absmagV "+0.68".
- GY_Andromedae appmagV "6.36".
- GY_Andromedae axisUnitless "> 0.25 AU".
- GY_Andromedae bV "+0.04".
- GY_Andromedae class "B9 pe".
- GY_Andromedae constell Andromeda_(constellation).
- GY_Andromedae eccentricity "0.47".
- GY_Andromedae epoch "J2000".
- GY_Andromedae hasPhotoCollection GY_Andromedae.
- GY_Andromedae luminosity "52".
- GY_Andromedae metalFe "0.86".
- GY_Andromedae name "GY And B".
- GY_Andromedae pError "0.72".
- GY_Andromedae parallax "6.23".
- GY_Andromedae periarg "17.7".
- GY_Andromedae periodUnitless "2.3586336000000004E7".
- GY_Andromedae propMoDec "-0.77".
- GY_Andromedae propMoRa "-15.64".
- GY_Andromedae radialV "+3.0".
- GY_Andromedae rotationalVelocity "31".
- GY_Andromedae temperature "10723".
- GY_Andromedae uB "-0.1".
- GY_Andromedae variable Alpha%C2%B2_Canum_Venaticorum_variable.
- GY_Andromedae subject Category:Alpha2_Canum_Venaticorum_variables.
- GY_Andromedae subject Category:Andromeda_(constellation).
- GY_Andromedae subject Category:B-type_main-sequence_stars.
- GY_Andromedae subject Category:HR_objects.
- GY_Andromedae subject Category:Henry_Draper_Catalogue_objects.
- GY_Andromedae subject Category:Hipparcos_objects.
- GY_Andromedae subject Category:Objects_named_with_variable_star_designations.
- GY_Andromedae subject Category:Spectroscopic_binaries.
- GY_Andromedae type Alpha2CanumVenaticorumVariables.
- GY_Andromedae type B-typeMainSequenceStars.
- GY_Andromedae type BinaryStar109221070.
- GY_Andromedae type CelestialBody109239740.
- GY_Andromedae type HIPObjects.
- GY_Andromedae type HRObjects.
- GY_Andromedae type HenryDraperCatalogueObjects.
- GY_Andromedae type NaturalObject100019128.
- GY_Andromedae type Object100002684.
- GY_Andromedae type ObjectsNamedWithVariableStarDesignations.
- GY_Andromedae type PhysicalEntity100001930.
- GY_Andromedae type SpectroscopicBinaries.
- GY_Andromedae type Star109444100.
- GY_Andromedae type Thing100002452.
- GY_Andromedae type Variable109468959.
- GY_Andromedae type Whole100003553.
- GY_Andromedae type CelestialBody.
- GY_Andromedae type Star.
- GY_Andromedae type PhysicalBody.
- GY_Andromedae comment "GY Andromedae (GY And) is an α2 Canum Venaticorum type variable star in the northern constellation Andromeda. Its brightness fluctuates in visual magnitude between 6.27m and 6.41m, making it a challenge to view with the naked eye even in good seeing conditions. The magnetic activity on this star shows an unusually long period of variability, cycling about once every 23 years.".
- GY_Andromedae label "GY Andromedae".
- GY_Andromedae label "GY Andromedae".
- GY_Andromedae label "HR 465".
- GY_Andromedae label "HR 465".
- GY_Andromedae label "HR 465".
- GY_Andromedae label "仙女座GY".
- GY_Andromedae sameAs HR_465.
- GY_Andromedae sameAs GY_Andromedae.
- GY_Andromedae sameAs HR_465.
- GY_Andromedae sameAs HR_465.
- GY_Andromedae sameAs HR_465.
- GY_Andromedae sameAs m.01sgk_.
- GY_Andromedae sameAs Q1207992.
- GY_Andromedae sameAs Q1207992.
- GY_Andromedae sameAs GY_Andromedae.
- GY_Andromedae wasDerivedFrom GY_Andromedae?oldid=591561675.
- GY_Andromedae isPrimaryTopicOf GY_Andromedae.
- GY_Andromedae name "GY Andromedae".
