astro_pettit

astro_pettit OP t1_iuea18y wrote

Sun setting behind the ISS solar panels, captured on my previous mission in 2012. The sheet Kapton substrate for the thousands of individual solar cells produces the deep red-orange glow when illuminated at the proper sun angles. Captured with a Nikon D3s, 24mm f1.4 lens, f8, 200th sec, ISO 800.

More photos from the ISS can be found on my Instagram and Twitter.

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astro_pettit OP t1_iroxuth wrote

I use Bogen arms as camera mounts to hold the camera in the position to make the wanted composition. In weightlessness, two Bagen arms can be connected together to make a very flexible positioning system. Now that ISS is flying LVLH attitude, making star field exposures longer that 2 seconds with a 24mm f1.4 lens gives stars as streaks.

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astro_pettit OP t1_irmna48 wrote

Large Magellanic Cloud taken from ISS during my first mission, Expedition 6 in 2003. This was taken when Space Station was flying XPOP attitude, a solar inertial attitude that allowed the solar panels to point towards the sun without tracking. Essentially, the station itself was the tracking mechanism. A solar inertial attitude is about one degree per day different from a stellar inertial attitude thus for 30 second time exposures the stars remain as pinpoints. Since about 2006, ISS has flown LVLH attitude, where one side remains pointed nadir towards Earth at all times and time exposures yield stars that are arcing trails.

This photo is a four image stack, taken with a Kodak-Nikon 760 (an early professional digital camera, a Nikon body with a Kodak FX-sized sensor), Nikkor 58mm f1.2 lens, ISO 800, with each exposure of 30 sec.

More astrophotography can be found on my Instagram and Twitter. Please let me know if you would like to see more here for Reddit!

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