Partial Solar Eclipse with an Airplane Crossing in Front of the Sun’s Disc


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I travelled to Antalya, in Turkey, to have a better weather and a larger percentage of the Partial Solar Eclipse visible, and bring with me my portable ED80 equipped with a Daystar Chromosphere filter. I was in the coastline and not farway from the airport, but didn´t imagine to have a lucky moment of capturing a nice plane crossing the only piece of the Sun which was not eclipsed by the Moon silhouette. Captured half an our before its ending, when was 11h38m UT (+3h Antalya) the image shows a single run of a few seconds in slow motion, revealing the waves of heat produced by the plane jets, causing turbulence in the atmosphere and distorting the moon’s limb. Another interesting phenomenon is visible, the contrails left behind from the aircraft, which in this case appeared as dark clouds for being against the bright disc of the sun. According to a BBC article: “Three things are needed for them to form: water vapour, cool air and particles on which the water vapour can condense. Water vapour is produced by planes as the hydrogen in its fuel reacts with oxygen in the air. In cold conditions (typically below around -40C (-40F)) it can condense, typically on the soot particles also emitted from aircraft engines, to a fog of droplets, which then freeze to form ice particles. The process broadly resembles frozen breath on a cold winter’s day. Not all aircraft produce contrails – they are estimated to occur in about 18% of flights. The air needs to be cool enough for the water to freeze, which is why they usually only appear above certain altitudes – typically 20,000ft (6km). In clear, cloudless air, contrails disappear quickly, as the dry ambient air makes the ice particles sublimate (pass from a solid to a gas). But if the atmosphere is humid, the ice particles cannot sublimate and contrails can linger for far longer.”

PT: Viajei até Antalya, na Turquia, à procura de melhor clima e de uma maior percentagem de visibilidade do Eclipse Solar Parcial, tendo trazido comigo um ED80 portátil, equipado com um filtro Daystar Chromosphere. O local escolhido foi junto à costa do Mediterrâneo e não muito longe do aeroporto, ainda assim, não imaginara ter a sorte de captar um avião de passageiros cruzando o único pedaço do Sol que não foi eclipsado pela silhueta da Lua. Captado meio hora antes de seu término, quando eram 11h38m UT (+3h Antalya) a imagem mostra um vídeo (sem stacking) de alguns segundos em câmera lenta, revelando as ondas de calor produzidas pelos jatos do avião, causando turbulência na atmosfera e distorcendo o limbo lunar. Outro fenómeno interessante visível são os rastros – contrails – deixados para trás pela aeronave, que neste caso apareceram como nuvens escuras por estarem em contraste contra o disco brilhante do sol. De acordo com um artigo da BBC, “Três coisas são necessárias para que eles se formem: vapor de água, ar frio e partículas nas quais o vapor de água se possa condensar. O vapor de água é produzido por aviões quando o hidrogénio em seu combustível reage com o oxigénio no ar. Em condições frias (normalmente abaixo de -40C (-40F)) ele pode condensar, normalmente nas partículas de fuligem também emitidas pelos motores das aeronaves, em uma névoa de gotículas, que então congelam para formar partículas de gelo. O processo é similar ao que ocorre com a nossa respiração num dia frio de inverno. Nem todas as aeronaves produzem rastos – estima-se que ocorram em cerca de 18% dos voos. O ar precisa estar frio o suficiente para que a água congele, e é por isso que eles geralmente só aparecem acima de certas altitudes – normalmente 20.000 pés (6 km). Num céu límpido e sem nuvens, os rastos desaparecem rapidamente, pois o ar num ambiente seco faz com que as partículas de gelo sublimem (passando de um sólido para um gás). Mas se a atmosfera estiver húmida, as partículas de gelo não podem sublimar e os rastos podem permanecer por muito mais tempo.”

 



Technical details | Detalhes Técnicos

William Optics 80ED | Star Adventure portable mount | Daystar Quark Ha Chromosphere filter| Player One Apollo-M Max | Single run without stacking captured from Antalya, Turkey.

Important Note | Nota Importante:  Never look and point a telescope or any other optical equipment directly to the sun without a proper and specialized safty filters! It can blind you forever.  PT: Nota Importante –  Nunca aponte um telescópio ou qualquer equipamento óptico directamente para o sol e observe através dele sem filtros especializados e seguros. Causará cegueira irreversível!

 

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