I'm not sure if this is a later model but it's what I found based on what you mentioned:
Quote:
Power requirement
12-volt DC - 2A (tip positive)
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Go to the "specs" tab for more information on the system:
https://www.telescope.com/Orion-SkyQ...e/p/102019.uts
As for plug dimensions possibly a standard 12 volt barrel jack unit, if there's any such beast as a standard unit. you may have something else 12 volts (do not power it up unless you know it's the correct polarity) which fits and can measure the outside dimension of the plug and the inner dimension. They come with both thick and thin centre pins which can be a pain (I always have the wrong one on hand).