minimum aperture to resolve discs of jovian moons
Posted 04 January 2009 - 06:03 PM
Thanks a lot.
Posted 04 January 2009 - 11:30 PM
I don't know where the thread you're looking for is. I'm sure there's one here somewhere. Last summer I was viewing Jupiter with my 12.5" f/6 Dobsonian and a 7 mm UO ortho, which gave 272x magnification. Best view I've ever had, the seeing was good and I could see whorls all over on Jupiter. To me it looked like the moons were were tiny disks and had different sizes.
Posted 04 January 2009 - 11:33 PM
Posted 05 January 2009 - 12:11 AM
Posted 05 January 2009 - 02:42 AM
Posted 05 January 2009 - 05:43 AM
Posted 05 January 2009 - 01:29 PM
Posted 05 January 2009 - 06:20 PM
Io: 1.20 arc seconds
Europa: 1.02 arc seconds
Ganymede: 1.73 arc seconds
Callisto: 1.58 arc seconds
Thus, a 5 inch or larger aperture should be able to resolve the disks of all four moons around opposition. Clear skies to you.