Bagged my second ISS solar transit on Tuesday afternoon. This one was almost a bust, as my original planned observing site to the west of Atlanta clouded over with less than 90 minutes remaining until the transit. Pulling up the visible satellite imagery on my laptop, I spotted an opening in the clouds that coincided with the transit path 35 miles to the south. An hour later, I exited the traffic-clogged interstate and skidded into a deserted church parking lot in Sharpsburg, Georgia (pop. 361). With the clock ticking down, I quickly set up my scope and was rewarded with some of the best views of the sun I've had in months -- I would have been happy even without seeing the ISS transit!
According to transit-finder.com, the ISS was about 317 miles above the earth and traveling at roughly 16,500 miles per hour at the time of the transit. The space station's angular size was 54.21″.
Here's a link to a video animation of the transit: https://youtu.be/660ZWOUgM2U.
I was lucky to be almost directly in the center line. The video animation is slowed to approximately 1/8 actual speed as the transit itself lasted only 0.64 s.
The video and the attached images were captured in SharpCap 3.2 with a Lunt LS50THa and ZWO ASI178mm camera. I used a single exposure for the sun and stacked the best 60% of 1,000 frames in AS!3. I used ImPPG and Photoshop for additional processing. In the colorized image, I included a single frame from the AVI file of the transit. Although I managed to capture 32 frames containing the ISS, most were too noisy for stacking.
Edited by ATL Gator, 22 April 2021 - 07:09 PM.