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Hint - Update a pre-launch kep set

Prior to certain launches, preliminary kep files are often available. To be useful, they must show the assumed launch time. Once you know the actual launch time, you can generate your own prediction, even before the official elements are published. Here's how: In the Satellite Information Window, Open the pre-launch data file. Choose Edit. Calculate the difference between the proposed and actual launch times. Add this amount to the epoch time of the pre-launch elements (generally it is not the launch time!), and enter the corrected time in the Adjust Epoch box. Then choose Special:Adjust RAAN to Epoch. Then click Use Adj to retain the updated elements. Don't forget to Save Settings to avoid losing the result.

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