ISS transits the Sun
Taken by Anthony Ayiomamitis on August 12, 2018 @
Northeastern outskirts of Athens, Greece
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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
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Date Taken: 2018:08:12 18:02:48
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Details:
Dr Phillips,
It is always a serious adrenaline rush pursuing the ISS transiting the Sun, for these opportunities are quite rare and require precise execution owing to the short transit duration.
Please find attached my fourth successful solar transit by the ISS and which lasted a "whopping" 0.55 seconds owing to its proximity to me byf about 440 km (it can range to well over 1000 km). Since my EOS 6D DSLR has a burst rate of 4.5 frames/sec or 0.22 sec/frame, the two images of the transiting ISS in the attached image are spaced about 0.22 seconds apart. Due to strong winds, a fast ISO (800) and quick exposure (1/1600 sec) were required to freeze the rapid apparent motion of the ISS as well as possible blurring due to the winds.
Solar activity is very useful with such opportunities since they allow one to nail focus as accurately as possible. However, due to solar minimum, there is no visible solar activity on the Sun and which made precise focusing somewhat difficult but it was nevertheless nailed perfectly.
Further details in relation to the attached image on my website at http://www.perseus.gr/Astro-Sat-Trans-2018-08-12.htm .
Best wishes from Greece.
Photographer's website:
http://www.perseus.gr
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