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HD 1, also known as HIP 422, is the first star catalogued in the Henry Draper Catalogue. It is located in the northern circumpolar constellation Cephus and has an apparent magnitude of 7.42, making it readily visible in binoculars, but not to the naked eye. The object is located relatively far away at a distance of 1,220 light years but is approaching the Solar System with a spectroscopic radial velocity of −27.3 km/s.

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rdf:type
rdfs:label
  • HD 1 (ca)
  • HD 1 (es)
  • HD 1 (en)
  • HD 1 (ja)
  • HD 1 (sv)
  • HD 1 (zh)
rdfs:comment
  • HD 1 és una a 1.289,2 anys llum de distància a la constel·lació de Cefeu. (ca)
  • HD 1, also known as HIP 422, is the first star catalogued in the Henry Draper Catalogue. It is located in the northern circumpolar constellation Cephus and has an apparent magnitude of 7.42, making it readily visible in binoculars, but not to the naked eye. The object is located relatively far away at a distance of 1,220 light years but is approaching the Solar System with a spectroscopic radial velocity of −27.3 km/s. (en)
  • HD 1 (HIP 422 / TYC 4294-80-1 / 2MASS J00050881+6750240)​ es una estrella binaria espectroscópica que se encuentra en la constelación de cefeo a 1290 años luz de la Tierra.​ Es la primera estrella del catálogo Henry Draper.​ HD 1 está catalogada como una estrella gigante amarilla-naranja con un diámetro 18 veces el del sol. Tiene una edad de 350 millones de años. ​Su contenido metálico es inferior al solar [Fe/H] = –0,12 ± 0,09. Sin embargo, el elemento α de silicio puede indicar una sobreabundancia de +0,13. (es)
  • HD 1 är en orange jättestjärna i stjärnbilden Cepheus. Det är den första stjärnan i stjärnkatalogen Henry Draperkatalogen. Stjärnan är av visuell magnitud +7,42 och kräver fältkikare för att kunna observeras. (sv)
  • HD 1为仙王座距地球1,289.2光年的恒星,为历元1900.0赤经最小的9等以上恒星。 (zh)
foaf:name
  • HD1 (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Red_circle.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Cepheus_constellation_map.svg
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absmag v
  • −0.01 (en)
age myr
appmag v
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  • G9-K0 IIIa (en)
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