Author Topic: Odd behavior  (Read 3067 times)

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Offline Darwin Teague

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Odd behavior
« on: February 03, 2015, 09:39:08 PM »
Recently I tracked an ISS pass. Version 2.5.1 with a Celestron CPC1100. Polar aligned mount.

 It was to rise in the northwest, pass almost directly overhead and set in the southeast.

I started the tracking as soon as it got above the horizon. It started tracking, but I could not see the ISS at all. When it got almost to my zenith, the scope went back toward the horizon, captured the ISS at about 45 degrees altitude  and tracked it virtually PERFECTLY.

IIRC, I synched the scope to a star near the first half of the predicted path.

I cannot for the life of me understand why it started tracking early and then corrected itself and went back and started tracking it properly.

The only thing I can think is that my clock correction program may have synced during the pass and corrected the clock. But I synced it no more than a minute or two before the pass started.

Any ideas?