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Douglas Point Nuclear Generating Station CANDU Model. Seen at the Canada Science and Technology Museum, Ottawa, ON. Storage Facility. Artifact no. 1980.0108.
Photo by: D. Maillet
View of the scale model CANDU reactor, display model. Right front side.
English below, followed by Portuguese.
The Messier 8 (aka Lac III-13, NGC 6523, BCA 237 or Sh 2-25), is definitely the protagonist of this rich nebular and stellar field in the Sagittarius constellation, near the centre of our galaxy.
With approximate apparent dimensions of 45’x30’ and a distance of about 4-5 thousand light-years, this very bright emission nebula has a real extension of nearly 100 light-years, factors that make it visible to the naked eye even in suburban areas, and a good target for binoculars or small telescopes, although it takes a somewhat big telescope (10-inch would be very fine) in a dark sky site to fully reveal its splendour to a visual observer – as I had the unforgettable opportunity to witness via a 11-inch SCT from a Bortle 2 sky site.
But the Lagoon Nebula, as it is popularly known, is surrounded by several other nebulae and HII regions, such as Sh 2-29, Sh 2-31, and Sh 2-32, to the bottom left, and M8 itself also encompasses a bright open star cluster, NGC 6530 as well as the famous Hourglass Nebula, at its luminous core, and some dark nebulae showing themselves as beautiful dark filaments cutting through their way along the field, partially blocking our view of the shimmering nebula behind.
This colour combination is the renowned Hubble Palette or SHO (Sulphur-Hydrogen-Oxygen), by which the narrowband SII captured data is assigned to the Red channel, the H-alpha data to Green, and the OIII to Blue. I also used the H-alpha as Luminance channel for this image.
Curiously, this SHO palette, at least in my opinion, makes the “Lagoon Nebula” an even more appropriate name for this object, perhaps because of the blue huge central region surrounded by the golden/brown border.
Please enjoy the view!
Cloudy weather in several moonless nights and processing turned this a work of multiple months.
This image was accomplished with the collaboration of my dear friend Romualdo Caldas.
And, being my inaugural image in narrowband and the first one processed in part with PixInsight, I would like to thank some other people who helped me in those regards: Rafael Compassi, Maicon Germiniani, Ernande Júnior, Gabriel Santos and Luiz Duczmal.
Equipment:
Telescope: SkyWatcher Esprit 80ED Super APO Triplet
Mount: SkyWatcher HEQ5
Camera: ZWO ASI1600MM-Cool
Accessories:
-SkyWatcher Field Flattener
-ZWO Electronic Filter Wheel
Filters and respective integration:
-Optolong H-alpha 1.25" 7nm: 54x300" (gain: 139.00) -15C bin 1x1
-Orion Extra Narrowband Filter OIII 1.25": 38x300" (gain: 139.00) -15C bin 1x1
-Starguider SII 10 nm: 36x270" (gain: 139.00) -15C bin 1x1
Total: 10.4 hours
Darks: 33
Bias: 100
Acquisition Software: Astrophotography Tool (APT)
Stacking and calibration software:
Deep Sky Stacker (DSS)
Post-Processing:
PixInsight and Photoshop
Português:
A Nebulosa da Lagoa em Hubble Palette (SHO) e adjacências
A Messier 8 (M8, também conhecida como Lac III-13, NGC 6523, BCA 237 ou Sh 2-25) é definitivamente a nebulosa a protagonizar esse rico campo estelar na constelação do Sagitário, próxima ao centro da nossa galáxia. Com as dimensões aparentes aproximadas de 45’x30’ e uma distância de 4 a 5 milhares de anos-luz da Terra, essa brilhante nebulosa de emissão tem uma extensão real de quase 100 anos-luz, fatores que a tornam visível a olho nu desde até mesmo áreas suburbanas de grandes cidades, e um bom alvo de observação para binóculos e pequenos telescópios, embora seja desejável um telescópio um tanto maior (10 polegadas seria bem razoável) e num céu escuro, para revelar totalmente seu esplendor a um observador visual – como eu mesmo tive a inesquecível oportunidade de testemunhar via um telescópio SCT de 11 polegadas em um local de céu Bortle 2.
Mas a Nebulosa da Lagoa, como é popularmente conhecida, é cercada de várias outras nebulosas e regiões HII, como as Sh 2-29, Sh 2-31 e Sh 2-32, vistas em grupo no região inferior esquerda da imagem. E a própria M8 também hospeda um brilhante aglomerado aberto de estrelas, o NGC 6530, bem como a Nebulosa da Ampulheta, que lhe serve de radiante núcleo, além de algumas nebulosas escuras que se apresentam como belos filamentos negros cortando seu caminho ao longo do campo de visão, parcialmente bloqueando nossa visão da fulgurante nebulosa logo atrás.
Essa combinação de cores é a conhecida Hubble Palette (ou Aquarela do Hubble – ficando assim famosa por ser empregada pelos processadores de imagens do famoso telescópio espacial), ou SHO (Enxofre-Hidrogênio-Oxigênio, na sigla em latim e inglês). Nessa combinação, os dados capturados em banda estreita de SII são atribuídos ao canal Vermelho do conjunto RGB (Vermelho-Verde-Azul), enquanto as capturas na faixa do Hidrogênio-alfa vão para o canal Verde, e as em Oxigênio-III vão para o Azul. Para essa imagem, eu também usei o H-alfa como canal de Luminância.
Curiosamente, esta aquarela SHO – ao menos na minha opinião – torna o nome “Nebulosa da Lagoa” ainda mais apropriado para este objeto, talvez pelo fato de tornar a imensa região central azul, e cercada pelas margens em tons marrons/dourados.
Por favor, desfrute da imagem em alta resolução.
Tempo nublado em muitas noites e o longo período de processamento fizeram deste um trabalho de múltiplos meses.
Essa imagem foi possível devido à colaboração do caro amigo Romualdo Caldas.
E, sendo minha imagem inaugural em banda estreita e a primeira processada com auxílio parcial do PixInsight, eu gostaria de agradecer a outras pessoas que me ajudaram nesse processo: Rafael Compassi, Maicon Germiniani, Ernande Júnior, Gabriel Santos e Luiz Duczmal.
The California Zephyr, ready for boarding and Eastward-bound, sits on a track alongside the Union Station in Denver Colorado. With a familiar orange “Union Station, Travel by Train” sign on both the railyard and public entrance sides advertising its primary purpose, the great hall, which was built in 1914, still functions as ticketing and check-in location for Amtrak. The site is now owned by RTD Denver, and it underwent a complete renovation in 2012 (about five years after this photo was made) as a transit oriented center for buses, light rail, and passenger trains. The remodeled Union Station complex also hosts a hotel, restaurants, and retailers serving both travelers and the general public.
Not too long ago, Tucson, Arizona was surrounded by Titan Missile Silos as in this diagramatic postcard. This particular silo is now called "The Titan Missile Museum".
After crossing the Colorado-New Mexico border ten times and traversing Cumbres Pass (elevation 10,022 ft / 3,055 m) in Colorado , Engine 484 of the Cumbres & Toltec Scenic RR prepares to cross State Highway 17. From here, the train descends and then crosses into New Mexico one final time while traveling to its final destination at the Chama Depot.
English below, followed by Portuguese (texto em inglês abaixo, seguido da versão em português).
Here is Volcán Maipo, located exactly in the border between Chile and Argentina, in the Andes mountain range, with Laguna Diamante in the background, totally in the Argentinian side of the border.
This picture was taken by my pilot friend César Dariman, when flying from Santiago (Chile) to São Paulo (Brazil), soon after having taken off on 31st January 2020. It was later processed by me.
Very distantly, a beautiful Cumulonimbus cloud with a huge top of Cirrus clouds (the distinctive anvil formation) contrasts with soothing deep blue skies, on the account of the temperature inversion layer immediatly above.
Português:
Na imagem, em primeiro plano, o Vulcão Maipo, localizado exatamente na fronteira entre o Chile e a Argentina, na Cordilheira dos Andes, com a Laguna Diamante ao fundo, situada inteiramente no lado argentino.
Esta imagem foi capturada pelo meu amigo piloto de aviação comercial, César Dariman, ao voar de Santiago (Chile) para São Paulo (Brazil), pouco após ter decolado, em 31 de janeiro de 2020. Foi posteriormente processada por mim.
Muito distante, no lado direito, nota-se uma bela nuvem do tipo Cumulonimbus, totalmente desenvolvida, com nuvens cirriformes ao topo, no característico formato de bigorna, contrastando com límpidos e lenitivos céus azuis, por força da camada de inversão térmica logo acima.
This image shows how close Jupiter and Saturn were on 20 December 2020, seen from Maceió-AL, Brazil, at 21:00 UT.
This was the first image where the two planets fit mutually in the Field of View (FOV) of the 12-inch telescope in prime focus with the QHY183C camera. During the two days that preceded the occasion, I had to use a f/6.3 focal reducer in order to accomplish that. And, before that, I had resorted to a 80 mm APO with a 2x Powermate, and, then, a C8 with the f/6.3 focal reducer.
30% out of about 1500 frames were stacked with AS!3 and then post-processed with Photoshop.
I was pleased with the results. And I hope you can enjoy!
This image was achieved with the collaboration of my friend Romualdo Caldas.
The California Zephyr, ready for boarding and Eastward-bound, sits on a track alongside the Union Station in Denver Colorado. With a familiar orange “Union Station, Travel by Train” sign on both the railyard and public entrance sides advertising its primary purpose, the great hall, which was built in 1914, still functions as ticketing and check-in location for Amtrak. The site is now owned by RTD Denver, and it underwent a complete renovation in 2012 (about five years after this photo was made) as a transit oriented center for buses, light rail, and passenger trains. The remodeled Union Station complex also hosts a hotel, restaurants, and retailers serving both travelers and the general public.