lhoujin,
thank you for pointing me to the Artificial Horizon Manager. This is exactly the kind of table list I had in mind.
But I used it and recognized that the created obstacle does not show up in the AvsT tool.
The obstacles are only visible on the skymap. I tried to plan a session with the skymap. But it is not intuitive. I can go forward in time, but I cannot slew the mount to this position of the object in the future. I would like to do this in order to have a look if the scope is pointing to the wall, roof, tree or free part of the sky. Maybe this could be changed?

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