2 ISS Transits, 1 Location, in 1 Day
Taken by Norman Carlson on December 24, 2018 @
Near Tucson, AZ
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Details:
Two ISS Transits from one location, in just 8 hours! With a cellphone as the camera and a small Dobsonian-mount telescope. Just a little before sunrise, at 6:37 am local time, I was set up in the right location to video a transit of the ISS across the moon. Then, 8 hours and 9 minutes later (about 5 orbits later), from exactly the same spot, the ISS transited across the sun. If I had been able to set up at the intersection of the two transit center-line paths, then the ISS would have perfectly bisected the disks of the moon and sun, but there were no roads out into the desert to that location. The site I could get to was within 500 meters of both center-lines, though, which was well within the path widths. The images show the individual frames from the videos stacked together. Each transit lasted less than 1.2 seconds, and I used a frame rate of 30 FPS. The lunar video used an exposure of 1/3000 second and an ISO of 400; the solar video (with a full aperture solar filter) used an exposure of 1/1000 second and an ISO of 800. Paths and calculations were from CalSky.com.
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