European Space Agency Flickr Update

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Fort McMurray fires
31-05-2016 03:26 PM CEST

europeanspaceagency posted a photo:

Fort McMurray fires

On 25 May 2016, the Sentinel-2A satellite captured these images of smoke and fires raging north of the Athabasca River near Fort McMurray in Canada’s Alberta province.

The image with the overall green colouring was created using the shortwave infrared bands from Sentinel-2’s instrument, and allow us to clearly see the fires on the ground (in bright orange). These bands also allow us to see through smoke – but not clouds.

The image with the blue and red colouring was created using the visible and near-infrared bands from the same acquisition, and shows smoke (in light blue) and burnt areas (in black).

The exact cause of the wildfires has not been determined, but unseasonably hot and dry weather has contributed to their rapid growth.

Satellites from several space agencies across the globe have imaged the fires, including the Sentinel-2A and recently launched Sentinel-3A satellites for Europe’s Copernicus programme.

To see the animated GIF of images, click here.

Credit: Contains modified Copernicus Sentinel data (2016), processed by ESA

Space Station Mercury
31-05-2016 01:36 PM CEST

europeanspaceagency posted a photo:

Space Station Mercury

Human Spaceflight Image of the Week:

On 9 May Mercury passed in front of the Sun as seen from Earth. These transits of Mercury occur only around 13 times every century, so astronomers all over Earth were eager to capture the event.

For astrophotographer Thierry Legault, capturing Mercury and the Sun alone was not enough, however – he wanted the International Space Station in the frame as well.

To catch the Station passing across the Sun, you need to set up your equipment within a ground track less than 3 km wide. For Thierry, this meant flying to the USA from his home near Paris, France.

On 9 May there were three possible areas to capture the Station and Mercury at the same time against the solar disc: Quebec, Canada, the Great Lakes and Florida, USA.

Choosing the right spot took considerable effort, says Thierry: “Canada had bad weather predicted and around Florida I couldn’t find a suitably quiet but public place, so I went to the suburbs of Philadelphia.”

With 45 kg of equipment, Thierry flew to New York and drove two hours to Philadelphia to scout the best spot. Even then, all the preparations and intercontinental travel could have been for nothing because the Station crosses the Sun in less than a second and any clouds could have ruined the shot.

“I was very lucky: 10 minutes after I took the photos, clouds covered the sky,” says a relieved Thierry.

“Adrenaline flows in the moments before the Station flies by – it is a one-shot chance. I cannot ask the space agencies to turn around so I can try again. Anything can happen.”

The hard work and luck paid off. The image here includes frames superimposed on each other to show the Station’s path. Mercury appears as a black dot at bottom-centre of the Sun.

For Thierry, the preparation and the hunt for the perfect shot is the best part.

“Astrophotography is my hobby that I spend many hours on, but even without a camera I encourage everybody to look up at the night sky. The International Space Station can be seen quite often and there are many more things to see. It is just a case of looking up at the right time.”

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Visit Thierry’s homepage here.

Credit: Thierry Legault

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