ISS from Jerusalem
Taken by Sylvain Weiller on May 20, 2018 @
Jerusalem, Israel
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Camera Used: Unavailable Unavailable
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Details:
20150520
At the end of Shavuot in Israel, one of the most important jewish festivity of the year which terminates after the apparition of three average stars in the dark sky, I had really no time to set up my usual tracking system before the pass (less than 1/2 hour left).
Too bad ! The pass was forecasted to be -4 Mg that is to say the maximum magnitude available !
I then did the following anybody with a good telescope (here C8 Edge) can do if wanted and here is the recipe :
- approximate orientation of the mount to the culmination coordinates (here SE, 81° altitude) with rather lose clamping
- Placement of a sensitive camera if available Full Frame (here Color A7S) at main focus
- Aiming at a bright star or planet (I centered Jupiter)
- Introducing a barlow (here 4x Powermate)
- While keeping manually the object centered (not so easy), adjusting focus
- While keeping the object centered (not so easy), centering precisely the Telrad as that that step was not done before
- Setting exposure to 1/1600 s (a must) and ISO to 16 000 or more in some less bright passes cases.
When the ISS appeared, I started recording (don't forget !!) and tried to track it manually (rather difficult) in the Telrad.
After end of the pass I was not hoping much to have even a single frame with the ISS !
Finally, after converting the original video to SER with PIPP, Autostackkert3 found automatically in the 25 000 frames a dozen of ISS images, from small to large. Only one near the culmination was nice enough to post her after RegiStax6 processing ...
Photographer's website:
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