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Description:
In astronomy, the Pleiades or Seven Sisters (Messier 45 or M45), is an open star cluster containing middle-aged hot B-type stars located in the constellation of Taurus. It is among the nearest star clusters to Earth and is the cluster most obvious to the naked eye in the night sky. The celestial entity has several meanings in different cultures and traditions.
The cluster is dominated by hot blue and extremely luminous stars that have formed within the last 100 million years. Dust that forms a faint reflection nebulosity around the brightest stars was thought at first to be left over from the formation of the cluster (hence the alternate name Maia Nebula after the star Maia), but is now known to be an unrelated dust cloud in the interstellar medium, through which the stars are currently passing. Computer simulations have shown that the Pleiades was probably formed from a compact configuration that resembled the Orion Nebula. Astronomers estimate that the cluster will survive for about another 250 million years, after which it will disperse due to gravitational interactions with its galactic neighborhood.
The cluster contains over 1,000 statistically confirmed members, although this figure excludes unresolved binary stars. The distance to the Pleiades can be used as an important first step to calibrate the cosmic distance ladder. As the cluster is so close to the Earth, its distance is relatively easy to measure and has been estimated by many methods. [source wikipedia]
Na astronomia, as Plêiades ou Sete Irmãs (Messier 45 ou M45) é um aglomerado aberto estelar composto por estrelas quentes de meia idade do tipo B localizado na constelação de Touro. Ele está entre os aglomerados abertos mais próximos da Terra e desta forma é facilmente visível a olho nu durante a noite. Esta entidade celestial possui vários significados em diferentes culturas e tradições.
O aglomerado é dominado por estrelas azuis extremamente quentes e luminosas que se formaram nos últimos 100 milhões de anos. Pensava-se primeiramente que a poeira que forma a fraca nebulosidade de reflexão nos entornos das estrelas brilhantes fosse proveniente dos restos da formação do aglomerado (daí um dos nomes de Nebulosa Maia nos entornos da estrela Maia), mas agora sabe-se que a nuvens de poeira no meio interestelar não estão relacionadas com a formação do aglomerado mas que as estrelas estão passando por elas. Simulações computacionais mostram que as Pleiades provavelmente se formaram de uma configuração compacta semelhante à Nebulosa de Órion. Os astrônomos estimam que o aglomerado sobreviverá por cerca de 250 milhões de anos quando então as estrelas se dispersarão devido às interações gravitacionais com sua vizinhança galáctica.
Estatisticamente já foram confirmadas mais de 1000 estrelas pertencentes ao aglomerado. A distância deste aglomerado até a Terra é de cerca de 443 anos luz. Por ser tão próximo é considerado um objeto importante na calibração dos métodos utilizados para se calcular as demais distâncias cósmicas. (fonte wikipedia inglês)
A imagem, em ISO 800, corresponde a uma exposição total de 2h50min (34 frames) registrada em duas sessões. Uma entre 03h46m e 04h48m do dia 26/07/2014 em Alto Paraíso de Goiás - GO no Sétimo Encontro Brasileiro de Astrofotografia e a outra entre 03h03m e 05h21m do dia 23/08/2014 na região de Brotas - SP em um encontro observacional do Aster, clube de astronomia de Campinas.
Equipamentos utilizados:
- Montagem Equatorial EQ-G Atlas Orion
- Refrator Meade 80mm F6 APO
- Câmera DSLR Canon T1i modificada com filtro Astrodon
- Guiagem com câmera Orion Starshoot e refrator Orion 80mm
- Filtro EOS Clip CLS Astronomik (na sessão de Brotas-SP para eliminar poluição luminosa)
Imagem capturada no software BackyardEOS e processada no software PixInsight e Photoshop CS5.
Bias, Flats e Darks aplicados.
Obs. Refratores não produzem spikes nas estrelas. O efeito aparece pois coloquei dois fios cruzados à frente da lente.
Uploaded: ...
Imaged with APT |
Southern Hemisphere Astro |
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