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Shlunko,
How long will a planet stay in the EP?
As Eric stated, it will depend on the specs of the EP, its apparent FOV and focal length. An object on the Celestial Equator could take 4 minutes to drift across the eyepiece at 60x but only 1 minute at 200x.
Limiting magnitudes are often theoretical and don't allow for varying skyglow and transparency. A practical estimate for your 130mm (roughly 5 inch) reflector would be about magnitude 11.5. An 8 inch scope will go down to mag 12.5 and a 10 inch scope down to mag 13.
Regards, Rob
Last edited by Robh; 14-08-2009 at 09:19 AM.
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