About: 28 Cygni

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28 Cygni is a binary star in the northern constellation of Cygnus. It is a faint blue-white hued star but visible to the naked eye with an apparent visual magnitude of 4.93. The distance to 28 Cyg, as estimated from its annual parallax shift of 5.3 mas, is around 620 light years. It has an absolute magnitude of −2.56, which means that if the star were just 10 parsecs (33 light-years) away it would be brighter than Sirius, the brightest star in the night sky.

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  • 28 Cygni is a binary star in the northern constellation of Cygnus. It is a faint blue-white hued star but visible to the naked eye with an apparent visual magnitude of 4.93. The distance to 28 Cyg, as estimated from its annual parallax shift of 5.3 mas, is around 620 light years. It has an absolute magnitude of −2.56, which means that if the star were just 10 parsecs (33 light-years) away it would be brighter than Sirius, the brightest star in the night sky. This primary object is a B-type main-sequence star with a stellar classification of B2.5 V, per Lesh (1968). Slettebak (1982) found a class of B2 IV(e), which would suggest this is a more evolved subgiant star. It is a Be star, which means the spectrum displays emission lines due a disk of ejected gas in a Keplerian orbit around the star. The star displays short-term variability with two or more periods, and is classified as an SX Arietis variable by Samus et al. (2017). It is spinning rapidly with a projected rotational velocity of 320 km/s; estimated at round 80% of the critical rotation rate. This is giving the star an oblate shape with an equatorial bulge out to 6.5 times the Sun's radius, compared to 5.7 at the poles. The central star is orbited by a secondary companion star, which is a subdwarf O star. After previous failed attempts to find the star, the companion was detected using interferometry, but the orbital parameters are unknown. (en)
  • 28 Cygni (b² Cygni) é uma estrela na direção da Cygnus. Possui uma ascensão reta de 20h 09m 25.62s e uma declinação de +36° 50′ 22.5″. Sua magnitude aparente é igual a 4.93. Considerando sua distância de 860 anos-luz em relação à Terra, sua magnitude absoluta é igual a −2.18. Pertence à classe espectral B2.5V. Possui planetas confirmados. É uma estrela Be. (pt)
  • 28 Cygni, som är stjärnans Flamsteed-beteckning, är en ensam stjärna belägen i den södra delen av stjärnbilden Svanen, som också har variabelbeteckningen V1624 Cygni. Den har en genomsnittlig skenbar magnitud på ca 4,93 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 5,3 mas, beräknas den befinna sig på ett avstånd på ca 620 ljusår (ca 189 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -0,4 km/s. (sv)
  • 天鵝座28,又名BD+36 3907,HD 191610、SAO 69518、HR 7708,是天鵝座的一颗恒星,视星等为4.93,位于銀經73.91,銀緯2.04,其B1900.0坐标为赤經20h 5m 42.7s,赤緯+36° 2.04′ 42″。 (zh)
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  • −2.56 (en)
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  • 4.930000 (xsd:double)
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  • B2.5 V or B2 IV + sdO (en)
dbp:constell
dbp:epoch
  • J2000 (en)
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  • 3.983000 (xsd:double)
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  • 1353.220000 (xsd:double)
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  • 0.225500 (xsd:double)
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  • 5.294700 (xsd:double)
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  • +15.562 (en)
dbp:propMoRa
  • +2.728 (en)
dbp:radius
  • 5.700000 (xsd:double)
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  • 320 (xsd:integer)
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  • 11338 (xsd:integer)
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rdfs:comment
  • 28 Cygni (b² Cygni) é uma estrela na direção da Cygnus. Possui uma ascensão reta de 20h 09m 25.62s e uma declinação de +36° 50′ 22.5″. Sua magnitude aparente é igual a 4.93. Considerando sua distância de 860 anos-luz em relação à Terra, sua magnitude absoluta é igual a −2.18. Pertence à classe espectral B2.5V. Possui planetas confirmados. É uma estrela Be. (pt)
  • 28 Cygni, som är stjärnans Flamsteed-beteckning, är en ensam stjärna belägen i den södra delen av stjärnbilden Svanen, som också har variabelbeteckningen V1624 Cygni. Den har en genomsnittlig skenbar magnitud på ca 4,93 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 5,3 mas, beräknas den befinna sig på ett avstånd på ca 620 ljusår (ca 189 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -0,4 km/s. (sv)
  • 天鵝座28,又名BD+36 3907,HD 191610、SAO 69518、HR 7708,是天鵝座的一颗恒星,视星等为4.93,位于銀經73.91,銀緯2.04,其B1900.0坐标为赤經20h 5m 42.7s,赤緯+36° 2.04′ 42″。 (zh)
  • 28 Cygni is a binary star in the northern constellation of Cygnus. It is a faint blue-white hued star but visible to the naked eye with an apparent visual magnitude of 4.93. The distance to 28 Cyg, as estimated from its annual parallax shift of 5.3 mas, is around 620 light years. It has an absolute magnitude of −2.56, which means that if the star were just 10 parsecs (33 light-years) away it would be brighter than Sirius, the brightest star in the night sky. (en)
rdfs:label
  • 28 Cygni (en)
  • 28 Cygni (pt)
  • 28 Cygni (sv)
  • 天津增六 (zh)
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  • 28 Cygni (en)
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