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Tau1 Serpentis, Latinized from τ1 Serpentis, is a single star in the Caput (Head) segment of the equatorial constellation of Serpens. It is a red hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.16. Based upon parallax measurements, this star is located at a distance of approximately 990 light years from the Sun, while it is drifting closer with a radial velocity of −16.5 km/s.

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  • Tau1 Serpentis (en)
  • Tau1 Serpentis (pt)
  • Tau1 Serpentis (sv)
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  • Tau1 Serpentis (τ1 Serpentis, förkortat Tau1 Ser, τ1 Ser) som är stjärnans Bayerbeteckning, är en ensam stjärna belägen i den mellersta delen av stjärnbilden Ormen, i den del som representerar ”ormens huvud” (Serpens Caput). Den har en genomsnittlig skenbar magnitud på 5,17 och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 3,6 mas, beräknas den befinna sig på ett avstånd på ca 900 ljusår (ca 280 parsek) från solen. (sv)
  • Tau1 Serpentis (9 Serpentis) é uma estrela na direção da constelação de Serpens. Possui uma ascensão reta de 15h 25m 47.41s e uma declinação de +15° 25′ 41.0″. Sua magnitude aparente é igual a 5.16. Considerando sua distância de 918 anos-luz em relação à Terra, sua magnitude absoluta é igual a −2.09. Pertence à classe espectral M1III. (pt)
  • Tau1 Serpentis, Latinized from τ1 Serpentis, is a single star in the Caput (Head) segment of the equatorial constellation of Serpens. It is a red hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.16. Based upon parallax measurements, this star is located at a distance of approximately 990 light years from the Sun, while it is drifting closer with a radial velocity of −16.5 km/s. (en)
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  • τ1 Serpentis (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Tau1SerLightCurve.png
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absmag v
  • −1.45 (en)
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