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ISS transit of Mars, September 14, 2020 | by tglenn174
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ISS transit of Mars, September 14, 2020

The International Space Station (ISS) transits Mars in this image. This is a composite image of individual frames extracted from a video of the event, and represents approximately 0.4s of elapsed time. Closeup from the individual frame showing the closest separation between Mars and the ISS is below:

 

flic.kr/p/2jH5Dnu

 

Details on both the ISS and Mars are visible, despite the short exposure, including Syrtis Major on Mars. The orbital trajectory was calculated by Calsky.com, and the transit was only visible along a 90m wide corridor along the ground, leaving a margin of error of about 45m on each side of the centerline. The angular velocity of the ISS was 2766"/s, and the actual ground velocity was 7.4km/s. The image was captured northeast of San Diego, CA, at 05:15:47 local time (PDT), and more information and data (including the raw exposure series) is available in the following video linked below:

 

youtu.be/oHcMvF-nP2s

 

Equipment used:

C9.25 Edge HD telescope

ASI183mm camera (no filter)

Focal length: 2350mm

Exposure: 0.35ms

Gain: 300 (66%)

ROI: 5496x1500 pixels

Frame rate recorded: 41 fps

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Uploaded on September 16, 2020