7 January 2017 | ISS Double Solar Transit

ISS Double Solar Transit

Image credit & copyright: Carsten Wartmann | Click image to enlarge

Image Data

  • Date: 21 April 2016
  • Location: South of Berlin, Germany
  • Camera: Nikon D5100
  • Optics: Celestron Mak127
  • Mount: Alt/Az Mount
  • Filter: Baader Astrosolar sun filter foil
  • Exposure: Videomode, ISO200, 1/1250s

In this interesting image you see the International Space Station transit the Sun, twice, from the same position, on the same day.

Obviously Carsten Wartmann from Germany was not just lucky. He carefully planned this picture by using CalSky.org, a service that calculates the path and visibility of celestial bodies for your position.

Although Carsten was unable to reach the location of the exact central crossing point due to accessibility, the CalSky path prognosis of the ISS changed the morning of the planned date in his favour and he was able to come very close.

He used a DSLR to film and later stacked the individual frames of the actual crossing to create this image.

The first crossing happened at 14:27 at a relative distance of 548 km. The second crossing happened at 17:39 at a relative distance of 922 km, which explains the different size of the ISS. As a bonus two sunspots are visible.

The video-footage used for this picture can be found here and more information on how Carsten managed to make this image can be found here.

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