About: 9 Persei

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9 Persei is a single variable star in the northern constellation Perseus, located around 4,300 light years away from the Sun. It has the Bayer designation i Persei; 9 Persei is the Flamsteed designation. This body is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of about 5.2. It is moving closer to the Sun with a heliocentric radial velocity of −15.2 km/s. The star is a member of the Perseus OB1 association of co-moving stars. 9 Persei has one visual companion, designated component B, at an angular separation of 12.3″ and magnitude 12.0.

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  • 9 Persei is a single variable star in the northern constellation Perseus, located around 4,300 light years away from the Sun. It has the Bayer designation i Persei; 9 Persei is the Flamsteed designation. This body is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of about 5.2. It is moving closer to the Sun with a heliocentric radial velocity of −15.2 km/s. The star is a member of the Perseus OB1 association of co-moving stars. This is a blue supergiant with a stellar classification of A2 Ia, a massive star that has used up its core hydrogen and is now fusing heavier elements. It is an Alpha Cygni variable (designated V474 Persei), a type of non-radial pulsating variable. It ranges in magnitude from 5.15 down to 5.25. The star has 10.5 times the mass of the Sun and has expanded to 89 times the Sun's radius. It is radiating over 12,000 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 9,840 K. 9 Persei has one visual companion, designated component B, at an angular separation of 12.3″ and magnitude 12.0. (en)
  • 9 Persei, som är stjärnans Flamsteed-beteckning, är en ensam stjärna belägen i den nordvästra delen av stjärnbilden, Perseus som också har Bayer-beteckningen i Persei och variabelbeteckningen V474 Persei. Den har en skenbar magnitud på ca 5,17 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 0,76 mas, beräknas den befinna sig på ett avstånd på ca 4 300 ljusår (ca 1 300 parsek) från solen. Den rör sig bort närmare solen med en heliocentrisk radialhastighet av ca -15 km/s. Stjärnan ingår i rörelsegruppen Perseus OB1. (sv)
  • 9 Persei (i Persei) é uma estrela na direção da Perseus. Possui uma ascensão reta de 02h 22m 21.43s e uma declinação de +55° 50′ 44.4″. Sua magnitude aparente é igual a 5.16. Considerando sua distância de 2050 anos-luz em relação à Terra, sua magnitude absoluta é igual a −0.89. Pertence à classe espectral A2Ia. É uma estrela variável Alpha Cygni. (pt)
  • 英仙座9,又名BD+55 598,HD 14489、SAO 23256、HR 685,是英仙座的一颗恒星,视星等为5.17,位于銀經135.51,銀緯-4.79,其B1900.0坐标为赤經2h 15m 22.8s,赤緯+55° -4.79′ 17″。 (zh)
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  • −4.73 (en)
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  • +0.37 (en)
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  • A2 Ia (en)
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  • J2000 (en)
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  • 1.740000 (xsd:double)
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  • +0.26 (en)
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  • −1.798 (en)
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  • +0.374 (en)
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  • −15.20 (en)
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  • 9840 (xsd:integer)
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  • −0.11 (en)
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  • 9 Persei, som är stjärnans Flamsteed-beteckning, är en ensam stjärna belägen i den nordvästra delen av stjärnbilden, Perseus som också har Bayer-beteckningen i Persei och variabelbeteckningen V474 Persei. Den har en skenbar magnitud på ca 5,17 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 0,76 mas, beräknas den befinna sig på ett avstånd på ca 4 300 ljusår (ca 1 300 parsek) från solen. Den rör sig bort närmare solen med en heliocentrisk radialhastighet av ca -15 km/s. Stjärnan ingår i rörelsegruppen Perseus OB1. (sv)
  • 9 Persei (i Persei) é uma estrela na direção da Perseus. Possui uma ascensão reta de 02h 22m 21.43s e uma declinação de +55° 50′ 44.4″. Sua magnitude aparente é igual a 5.16. Considerando sua distância de 2050 anos-luz em relação à Terra, sua magnitude absoluta é igual a −0.89. Pertence à classe espectral A2Ia. É uma estrela variável Alpha Cygni. (pt)
  • 英仙座9,又名BD+55 598,HD 14489、SAO 23256、HR 685,是英仙座的一颗恒星,视星等为5.17,位于銀經135.51,銀緯-4.79,其B1900.0坐标为赤經2h 15m 22.8s,赤緯+55° -4.79′ 17″。 (zh)
  • 9 Persei is a single variable star in the northern constellation Perseus, located around 4,300 light years away from the Sun. It has the Bayer designation i Persei; 9 Persei is the Flamsteed designation. This body is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of about 5.2. It is moving closer to the Sun with a heliocentric radial velocity of −15.2 km/s. The star is a member of the Perseus OB1 association of co-moving stars. 9 Persei has one visual companion, designated component B, at an angular separation of 12.3″ and magnitude 12.0. (en)
rdfs:label
  • 9 Persei (en)
  • 9 Persei (pt)
  • 9 Persei (sv)
  • 英仙座9 (zh)
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  • 9 Persei (en)
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