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天鷹座28，又名BD+12 3879，HD 181333、SAO 104722、HR 7331，是天鷹座的一颗恒星，视星等为5.53，位于銀經47.14，銀緯-0.52，其B1900.0坐标为赤經19h 14m 59.3s，赤緯+12° -0.52′ 24″。
, 28 Aquilae, abbreviated 28 Aql, is a star … 28 Aquilae, abbreviated 28 Aql, is a star in the equatorial constellation of Aquila. 28 Aquilae is its Flamsteed designation though it also bears the Bayer designation A Aquilae, and the variable star designation V1208 Aquilae. It has an apparent visual magnitude is 5.5, making this a faint star that requires dark suburban skies to view (according to the Bortle Dark-Sky Scale). The annual parallax shift of 9.6 mas means this star is located at a distance of approximately 340 light-years (100 parsecs) from Earth. The spectrum of this star matches a stellar classification of F0 III. Despite consistent spectral classifications as a giant star, models show that it is just reaching the end of its main sequence lifetime at an age of 655 million years. The variability of 28 Aquilae was discovered by Michel Breger in 1969. It was revealed to be a Delta Scuti-type pulsating variable star with at least two periods of pulsation. The known periods have frequencies of 6.68 and 7.12 cycles per day. The outer atmosphere has an effective temperature of 7,250 K, which lies in the range of a yellow-white hued F-type star. range of a yellow-white hued F-type star.
, 28 de l'Àguila (28 Aquilae) és una estrella de la constel·lació de l'Àguila. Té una magnitud aparent de 5,53. Sembla que és un sistema triple, variable del tipus δ Scuti.
, 28 Aquilae, som är stjärnans Flamsteed-bet … 28 Aquilae, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den mellersta delen av stjärnbilden Örnen, som också har Bayer-beteckningen A Aquilae. Den har en genomsnittlig skenbar magnitud på ca 5,53 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 9,6 mas, beräknas den befinna sig på ett avstånd på ca 339 ljusår (ca 104 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet av ca 4,5 km/s.iocentrisk radialhastighet av ca 4,5 km/s.
, 28 Aquilae è una stella gigante bianco-gialla di magnitudine 5,53 situata nella costellazione dell'Aquila. Dista 347 anni luce dal sistema solare.
, 28 Aquilae (A Aquilae) é uma estrela na di … 28 Aquilae (A Aquilae) é uma estrela na direção da Aquila. Possui uma ascensão reta de 19h 19m 39.35s e uma declinação de +12° 22′ 28.7″. Sua magnitude aparente é igual a 5.53. Considerando sua distância de 347 anos-luz em relação à Terra, sua magnitude absoluta é igual a 0.39. Pertence à classe espectral F0III.a 0.39. Pertence à classe espectral F0III.
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28 Aquilae, som är stjärnans Flamsteed-bet … 28 Aquilae, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den mellersta delen av stjärnbilden Örnen, som också har Bayer-beteckningen A Aquilae. Den har en genomsnittlig skenbar magnitud på ca 5,53 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 9,6 mas, beräknas den befinna sig på ett avstånd på ca 339 ljusår (ca 104 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet av ca 4,5 km/s.iocentrisk radialhastighet av ca 4,5 km/s.
, 28 Aquilae è una stella gigante bianco-gialla di magnitudine 5,53 situata nella costellazione dell'Aquila. Dista 347 anni luce dal sistema solare.
, 天鷹座28，又名BD+12 3879，HD 181333、SAO 104722、HR 7331，是天鷹座的一颗恒星，视星等为5.53，位于銀經47.14，銀緯-0.52，其B1900.0坐标为赤經19h 14m 59.3s，赤緯+12° -0.52′ 24″。
, 28 Aquilae (A Aquilae) é uma estrela na di … 28 Aquilae (A Aquilae) é uma estrela na direção da Aquila. Possui uma ascensão reta de 19h 19m 39.35s e uma declinação de +12° 22′ 28.7″. Sua magnitude aparente é igual a 5.53. Considerando sua distância de 347 anos-luz em relação à Terra, sua magnitude absoluta é igual a 0.39. Pertence à classe espectral F0III.a 0.39. Pertence à classe espectral F0III.
, 28 de l'Àguila (28 Aquilae) és una estrella de la constel·lació de l'Àguila. Té una magnitud aparent de 5,53. Sembla que és un sistema triple, variable del tipus δ Scuti.
, 28 Aquilae, abbreviated 28 Aql, is a star … 28 Aquilae, abbreviated 28 Aql, is a star in the equatorial constellation of Aquila. 28 Aquilae is its Flamsteed designation though it also bears the Bayer designation A Aquilae, and the variable star designation V1208 Aquilae. It has an apparent visual magnitude is 5.5, making this a faint star that requires dark suburban skies to view (according to the Bortle Dark-Sky Scale). The annual parallax shift of 9.6 mas means this star is located at a distance of approximately 340 light-years (100 parsecs) from Earth. 340 light-years (100 parsecs) from Earth.
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28 de l'Àguila
, 28 Aquilae
, 天鷹座28
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