Orion Nebula Immersed in the Reddish Emission from Hydrogen Gas

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A deep wide field view shows Orion Nebula M42, immersed in the reddish emission from the light of hydrogen gas excited by energetic newly-formed hot and young stars. Blue-violet coloration, comes from the reflected radiation from the massive O-class stars. This complex contains dark nebulae, emission nebulae, reflection nebulae, and H II regions. The Orion Nebula (M42) is a diffuse and large nebula complex situated in the Milky Way, being south of Orion’s Belt in the constellation of Orion, is one of the brightest and beautiful nebulae also visible to naked eye in the night sky. M42 is located at a distance of about 1350 light years and is the closest region of massive star formation to Earth. The M42 nebula is estimated to be 24 light years across. It has a mass of about 2000 times the mass of the Sun. This nebula has revealed much about the process of how stars and planetary systems are formed from collapsing clouds of gas and dust. Astronomers have directly observed protoplanetary disks, brown dwarfs, intense and turbulent motions of the gas, and the photo-ionizing effects of massive nearby stars in the nebula. Below, in the lower left corner, is partially visible the red cloud where is located the well known Horse-head nebula. But besides this colorful field captured from Cumeada Observatory, official headquarter of Dark Sky® Alqueva Reserve, Portugal, a nice faint galaxy and another less bright, can both be visible in the upper right corner of the image.

PT: Uma visão ampla e profunda mostra a nebulosa de Orion M42, imersa numa tonalidade avermelhada, resultado de uma emissão brilhante a partir do gás de hidrogénio excitado por estrelas quentes e energéticas, recém-formadas. A coloração azul-violeta visível na fotografia, provém da radiação refletida das estrelas da classe-O. Este complexo contém nebulosas escuras, nebulosas de emissão, nebulosas de reflexão e regiões H II. A Nebulosa de Orion (M42) é um grande complexo nebuloso difuso situado na Via Láctea, a sul do Cinturão de Orion na constelação de Orion, sendo também uma das mais brilhantes e fascinantes nebulosas visíveis a olho nu no céu noturno. M42 está localizado a uma distância de cerca de 1350 anos-luz e é a região mais próxima da Terra na formação de estrelas maciças. A nebulosa M42 está estimada em 24 anos-luz de diâmetro. Tem uma massa de cerca de 2000 vezes a massa do Sol. O estudo desta nebulosa já permitiu revelar muito sobre o processo de como as estrelas e os sistemas planetários são formados por nuvens de gás e poeira em colapso. Os astrónomos observaram directamente discos protoplanetários, anãs castanhas, movimentos intensos e turbulentos de gás e os efeitos foto-ionizantes de estrelas maciças próximas, na nebulosa.



Above from left to right, a close-up view showing the sharp details on small structures of M42. And a close-up view showing two faint galaxies in the right edge. Below, is a starless image of Orion field in Ha (black and white view), showing the intricate and refined delicacy from the clouds of hydrogen gas.

PT: Acima, da esquerda para a direita, uma visão ampliada revela os detalhes nítidos em pequenas estruturas da nebulosa M42 e NGC1977. A seguir, uma visão de perto mostra duas galáxias ténues visíveis no extremo direito da imagem. Abaixo, é possível ver uma imagem (sem estrelas) do campo de Orion em Ha (a preto e branco), mostrando a delicadeza intrincada e refinada das nuvens de gás de hidrogénio.


Technical details | Detalhes Técnicos

Taka FSQ-106ED + QE-Reducer (f/3,6) – EM200 auto-guided | Nikon D810a modified | ISO800 – Sub Exp. 150 sec. + multiple shorter exposures | | ISO3200 – Sub Exp. 8 minutes with Ha 7nm filter | Total integration of  276 min/4,6h (106 minutes in RGB + 170 minutes in Ha). Processing on PixInsight 1.8.8-7 and Photoshop CC 2021. Cumeada Observatory from Dark Sky® Alqueva Reserve, Reguengos de Monsaraz..


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