International Space Station star trails - JSC2012E039800

Autor:

NASA/Don Pettit

Shortlink:

https://czwiki.cz/b/9bc3d

Zdroj:

Wikimedia Commons

Formát:

4126 x 2746 Pixel (1697227 Bytes)

Popis:

Star trail composite image created by International Space Station Expedition 30 crew member Don Pettit using images ISS030E171842 through ISS030E171889.

Expedition 30 and Expedition 31 Flight Engineer Don Pettit provided information about photographic techniques used to achieve the images: "My star trail images are made by taking a time exposure of about 10 to 15 minutes. However, with modern digital cameras, 30 seconds is about the longest exposure possible, due to electronic detector noise effectively snowing out the image. To achieve the longer exposures I do what many amateur astronomers do. I take multiple 30-second exposures, then 'stack' them using imaging software, thus producing the longer exposure."

The image includes many natural and artificial lights that astronauts see while passing over the night side of Earth. On the ground, stationary features like cities appear as pale yellow-white streaks.

Looking toward the horizon, thunderstorms dot the landscape. Many of the compiled frames captured bright white lightning flashes. Above the horizon, a faint green-yellow phenomenon called airglow hugs the upper atmosphere. Look carefully at the large version of this image for at least one streak of light that is not aligned with all the others. That is a satellite. Additional info from this source.

The camera for these shots is "mounted on a bracket in the Cupola" [1].

Licence:

Public domain

Credit:

NASA JSC Flickr account

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