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sinusoidal satellite trails.


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Some time ago I posted a problem I had with slightly elongated stars. A characteristic of this was that satellite trails across a frame showed a distinct and very even sinusoidal path. To cut a long story short I've now discovered that it was caused by a slight vibration which was due to some of the screws on the mount and telescope being slightly loose.


The scope is a Newtonian and the first problem was that one of the locking screws on the mirror was loose. I found this while adjusting the collimation.


The second problem was one of the grub screws holding the mounting plate on which the dovetail bar sits was also slightly loose. I had previously fitted a new, wider mounting plate.

Anyway the moral is "Keep your screws and bolts tight".






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