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Inertia is a strange thing - the way a bearing is tightened will determine the point at which friction is overcome and must be determined by experiment.
The system should be balanced anyway so the mass inertia will be almost zero as there is no acceleration involved (not at 15 degree an hour at any rate.)
All you are overcoming is the stiction between the bearing surfaces and the grease.
I reckon a small scope like that will come in at 20 watts no problem - depending on your mount size
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