International Space Station Crossing the Crescent Moon

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The image shows a sequence of the ISS – International Space Station – crossing the crescent moon disc over Borba region, in Alentejo, Portugal, on 18th January 2021 at UT 19h14m41s. In the background, a detailed moon features a surface 30% directly illuminated by the sun and spread by contrasted craters. Carrying on board 7 astronauts from the Expedition 64, the large artificial satellite orbiting our planet with a width of 108.5 meters seems although very small when compared with the moon´s disc with an angular size of 31.2′. Indeed, the moon was 42.3 times larger than the ISS during this particular passage. Although, larger structures and the main solar panels are well possible to distinguish in the image. The angular size of the ISS was 43.10″ arc seconds at a distance of 644 km and a speed of 7,38km/s, it has just crossed the moon in a blink of an eye during 1.10s. International Space Station (ISS) completes an entire orbit around Earth each 90 minutes, but these events are not happening so often. To capture this scene, I´ve used a Nikon D810a at full speed (6 frames per second) and Sigma Sport lens at 600mm, plus a 1,4x converter (850mm) and a sensor cropped to a factor of 1,5x with a portable mount star adventure to track the moon permanently. ISO 800 and 1/400s of exposure.

PT: A imagem revela uma sequência da ISS – Estação Espacial Internacional – cruzando o disco da lua crescente sobre a região de Borba, no Alentejo, Portugal, no dia 18 de janeiro de 2021 às 19h14m41s UT. Em pano de fundo, uma lua detalhada apresenta uma superfície 30% iluminada directamente pelo sol e repleta de crateras contrastantes. Transportando a bordo 7 astronautas da Expedição 64, o maior satélite artificial a orbitar o nosso planeta Terra, tem uma largura de 108,5 metros, embora pareça muito pequeno quando comparado com disco lunar com um tamanho angular de 31,2′ (minutos de arco). Na verdade, a lua encontrava-se 42,3 vezes maior do que a ISS durante esta passagem em particular. Porém, as maiores estruturas e os painéis solares principais são bem possíveis de distinguir na imagem. Com o tamanho angular de 43,10″ (segundos de arco), a ISS passou a uma distância de 644 km e uma velocidade de 7,38 km/s, cruzando a lua num piscar de olhos, durante cerca de 1,10 segundos. A Estação Espacial Internacional (ISS) completa uma órbita inteira ao redor da Terra a cada 90 minutos, mas eventos como este não acontecem com tanta frequência. Para captar esta imagem, usei uma Nikon D810a na máxima velocidade (6 fotografmas por segundo) e uma lente Sigma Sport de 600 mm, com um conversor de 1,4x (850 mm) e um factor crop de 1,5x aplicado. Foi ainda usada uma montagem portátil,  Star Adventure, afim de garantir o seguimento permanente da Lua. ISO 800 e exposição de 1/400s.


Below is available a time lapse video and a circular fish-eye image captured during this event. Click on each image below to entering in each dedicated page.

PT: Em baixo é possível aceder a uma sequência video time lapse e a uma imagem circular fish-eye captada durante este evento. Click em cada imagem para aceder à respectiva página.





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