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Don't you just love those computers, even if they are mini size!!! As far as sizes of objects, many astronomical catalogues give the size of an object. As an example, this excellent post by glenc has an excel file of the brightest 111 DSO's that are not on the Messier list. The size of each is there. I'm a bit vague on these things myself, trying to get my head around these sizes compared to the field of view of various eypieces!! There is a bit of a learning curve out there and I'm definitely still on it. There are many other lists by Glen,as well as others, covering different classes of DSO, galaxies, globulars, planetaries etc. Worth a site search. Cheers, Paul.
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