NGC 7000 North America Nebula Revealing Complex Structures of Fine Details from Hydrogen-alpha Light

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NGC 7000 is a bright emission nebula tracing the continental shape of North America. Discovered by William Herschel on 1786, it lies at about 1,500 light-years away from us, belonging to a larger complex of bright red emission nebulosity and surrounded by dark nebulae in the constellation of Cygnus, at about 3º from Deneb star. The “Gulf of Mexico” is a region where the obscured dust lanes are visible from dark nebula LDN 935, while “Mexico and Central America” reveals the bright interesting and intricate area known as the Cygnus Wall, a true stellar nursery of newly formed stars. The wall is eroded and illuminated by bright young stars, partially not visible for being occulted behind the dust they have just created. The image captured from Dark Sky® Alqueva observatory, comprise RGB images combined with narrowband 7 nanometer hydrogen-alpha images. Like an art painting from Nature, a starless and less distractive version of only the monochrome Ha light and the result of HaRGB, shows the brightest regions in an incredibly sharp rich field shaped by complex structures of fine details from hydrogen-alpha nebulosity, against the fine dark dust lanes, particularly visible close to the Cygnus Wall. Both versions are available in portrait and landscape mode, to help conduct the reader attention for the most interesting parts of the image.

PT: NGC 7000 é uma nebulosa de emissão brilhante que traça a forma continental da América do Norte. Descoberta por William Herschel em 1786, encontra-se a cerca de 1.500 anos-luz de nós, pertencendo a um complexo muito grande de nebulosidade de emissão vermelha brilhante hidrogénio-alfa (Ha) e rodeado por nebulosas escuras localizado na constelação do Cisne, a cerca de 3º da estrela Deneb. O “Golfo do México” é uma região onde as faixas de poeira obscurecidas são visíveis da nebulosa escura LDN 935, enquanto “México e América Central” revela a interessante e intrincada área brilhante conhecida como Muralha do Cisne, um verdadeiro berçário estelar de estrelas recém-formadas. A parede está erodida e iluminada por estrelas jovens e brilhantes, parcialmente ocultadas pela própria poeira que acabaram de criar. A imagem captada a partir do observatório oficial do Dark Sky® Alqueva, na Cumeada, compreende a combinação de imagens RGB na faixa da luz visível, combinadas com imagens de hidrogénio-alfa em banda estreita de 7 nanómetros. Como uma pintura de arte da própria Natureza, uma versão sem estrelas e menos distrativa apenas da luz monocromática Ha e o resultado de HaRGB, mostra as regiões mais brilhantes em um campo incrivelmente nítido e rico, moldado por estruturas complexas de detalhes finos de nebulosidade hidrogénio-alfa contra finas faixas de poeira escura, particularmente visíveis perto da Muralha do Cisne. Ambas as versões estão disponíveis em modo retrato e paisagem, para ajudar a direcionar a atenção do leitor para as partes mais interessantes da imagem.



Above from left to right, a starless landscape version shows the sharp details and small structures in the monochromatic Ha light as well as in HaRGB combination.

PT: Acima, da esquerda para a direita, uma versão sem estrelas e em modo paisagem revela os detalhes nítidos e as pequenas estruturas visíveis na imagem monocromática em Ha e em HaRGB combinados. 


Below from left to right, a starless portrait version shows the sharp details and small structures in the monochromatic Ha light as well as in HaRGB combination.

PT: Abaixo, da esquerda para a direita, uma versão sem estrelas e em modo retrato revela os detalhes nítidos e as pequenas estruturas visíveis na imagem monocromática em Ha e em HaRGB combinados. 



Technical details | Detalhes Técnicos

Taka FSQ-106ED at F5 – EM200 auto-guided in Asiair Pro| Nikon D850 modified | ISO2500 – Sub Exp. 6 min. in RGB| | ISO2500 – Sub Exp. 6 min. with Ha 7nm filter | Total integration of  438 min/7,5h (156 minutes in RGB + 282 minutes in Ha). Processing on PixInsight 1.8.9-1 and Photoshop CC 2022. Cumeada Observatory from Dark Sky® Alqueva Reserve, Reguengos de Monsaraz..


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