27 Cygni (original) (raw)
27 Cygni (b¹ Cygni) é uma estrela na direção da Cygnus. Possui uma ascensão reta de 20h 06m 21.93s e uma declinação de +35° 58′ 24.7″. Sua magnitude aparente é igual a 5.38. Considerando sua distância de 79 anos-luz em relação à Terra, sua magnitude absoluta é igual a 3.46. Pertence à classe espectral K0IV. É uma estrela variável RS Canum Venaticorum.
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| dbo:abstract | 27 Cygni is a subgiant star in the northern constellation of Cygnus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.38. The distance to this system, as estimated from its annual parallax shift of 41.77 mas, is 78.1 light-years. At that distance, the visual magnitude is diminished by an extinction of 0.05 due to interstellar dust. It is moving closer to the Earth with a heliocentric radial velocity of −33 km/s, and has a relatively high proper motion, traversing the celestial sphere at the rate of 0.495″ per year. 27 Cygni is a G-type subgiant with a stellar classification of G8.5 IVa, a star that has used up its core hydrogen and is starting to expand. It was found to be slightly variable by Percy et al. (1986), changing by up to 0.05 in visual magnitude with a characteristic time scale of 50–60 days. Further observations suggested a possible rotation period of around 42 days. Samus et al. (2017) classify it as a suspected RS Canum Venaticorum variable, meaning that it is a close binary star whose components have star-spots that cause rotationally-modulated variations in brightness. It has been given the variable star designation V2008 Cygni. 27 Cygni is listed in multiple star catalogues with three faint companions within one arc-minute. The two closer ones are unrelated background objects, while the third has a similar distance and space motion and is described as a common proper motion companion. (en) 27 Cygni, som är stjärnans Flamsteed-beteckning, är en ensam stjärna belägen i den södra delen av stjärnbilden Svanen, som också har Bayer-beteckningen b1 Cygni och variabelbeteckningen V2008 Cygni. Den har en genomsnittlig skenbar magnitud på ca 5,38 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 41,8 mas, beräknas den befinna sig på ett avstånd på ca 78 ljusår (ca 24 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -33 km/s. På det beräknade avståndet minskar stjärnans skenbara magnitud med 0,05 enheter genom en skymningsfaktor orsakad av interstellärt stoft. Stjärnan har en relativt stor egenrörelse och förflyttar sig över himlavalvet med en hastighet av 0,495 bågsekunder per år. (sv) 27 Cygni (b¹ Cygni) é uma estrela na direção da Cygnus. Possui uma ascensão reta de 20h 06m 21.93s e uma declinação de +35° 58′ 24.7″. Sua magnitude aparente é igual a 5.38. Considerando sua distância de 79 anos-luz em relação à Terra, sua magnitude absoluta é igual a 3.46. Pertence à classe espectral K0IV. É uma estrela variável RS Canum Venaticorum. (pt) 天鵝座27，又名BD+35 3959，HD 191026、SAO 69413、HR 7689，是天鵝座的一颗恒星，视星等为5.36，位于銀經72.86，銀緯2.1，其B1900.0坐标为赤經20h 2m 38.8s，赤緯+35° 2.1′ 49″。 (zh) |
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| dbp:absmagV | 3.480000 (xsd:double) |
| dbp:appmagV | 5.380000 (xsd:double) |
| dbp:bV | +0.85 (en) |
| dbp:class | G8.5 IVa (en) |
| dbp:constell | dbr:Cygnus_(constellation) |
| dbp:epoch | J2000 (en) |
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| dbp:parallax | 41.771800 (xsd:double) |
| dbp:propMoDec | −440.042 (en) |
| dbp:propMoRa | −225.032 (en) |
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| rdfs:comment | 27 Cygni (b¹ Cygni) é uma estrela na direção da Cygnus. Possui uma ascensão reta de 20h 06m 21.93s e uma declinação de +35° 58′ 24.7″. Sua magnitude aparente é igual a 5.38. Considerando sua distância de 79 anos-luz em relação à Terra, sua magnitude absoluta é igual a 3.46. Pertence à classe espectral K0IV. É uma estrela variável RS Canum Venaticorum. (pt) 天鵝座27，又名BD+35 3959，HD 191026、SAO 69413、HR 7689，是天鵝座的一颗恒星，视星等为5.36，位于銀經72.86，銀緯2.1，其B1900.0坐标为赤經20h 2m 38.8s，赤緯+35° 2.1′ 49″。 (zh) 27 Cygni is a subgiant star in the northern constellation of Cygnus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.38. The distance to this system, as estimated from its annual parallax shift of 41.77 mas, is 78.1 light-years. At that distance, the visual magnitude is diminished by an extinction of 0.05 due to interstellar dust. It is moving closer to the Earth with a heliocentric radial velocity of −33 km/s, and has a relatively high proper motion, traversing the celestial sphere at the rate of 0.495″ per year. (en) 27 Cygni, som är stjärnans Flamsteed-beteckning, är en ensam stjärna belägen i den södra delen av stjärnbilden Svanen, som också har Bayer-beteckningen b1 Cygni och variabelbeteckningen V2008 Cygni. Den har en genomsnittlig skenbar magnitud på ca 5,38 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 41,8 mas, beräknas den befinna sig på ett avstånd på ca 78 ljusår (ca 24 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -33 km/s. På det beräknade avståndet minskar stjärnans skenbara magnitud med 0,05 enheter genom en skymningsfaktor orsakad av interstellärt stoft. Stjärnan har en relativt stor egenrörelse och förflyttar sig över himlavalvet med en hastighet av 0,495 bågsekunde (sv) |
| rdfs:label | 27 Cygni (en) 27 Cygni (pt) 27 Cygni (sv) 天津增五 (zh) |
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| foaf:name | 27 Cygni (en) |
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