Click that caught ISS across the Moon

Amateur photographer Dylan O’Donnell captured the image above of the ISS transiting the moon on June 30th.

O’Donnell writes that he’s been planning and waiting for this photo opportunity for 12 months, keeping a careful eye on alerts sent by CalSky about potential flyovers. “I got one this week and this was adjusted by 15 seconds by the time of the “occultation””, says O’Donnell. The shutter speed was 1/1650s and the ISO was 800.

Significantly, it passes across the Moon in just 0.33 seconds.

“O’Donnell used a Canon 70D attached to a Celestron 9.25” telescope. You can read about the process on his blog.

I took about a second of further exposures on either side of the pass to stack the lunar surface detail using AutoStakkert2, and the increased the saturation in post to create this colour enhanced version of the moon.

Dylan’s previous work has received a lot of acclaim, with one of his recent photographs of Moon taken on March 20 being honoured as the Astronomy Picture of the Day by NASA. However the array colors mostly relate to the chemical composition of the moon, he noted.

In this image, the space station was roughly 400km above Mr O’Donnell’s home town of Byron Bay in New South Wales, but even at this distance, the distinct shape and features of the orbital outpost are clearly visible, including its solar panels and various pressurised modules.

He includes a close up crop of his image so you can see the definition of the satellite.

Once the flyby was over, O’Donnell reviewed his photos and was delighted to find that he had captured the shot he was hoping for. Oh, and as if that wasn’t cool enough, he he offers up the majority of his images completely free.

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