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Re: [Phys-L] Ex: Great Conjunction

Dear all, I failed to set the sharing permission on my picture and several of you wrote to let me know. I think it’s fixed now.

John Mallinckrodt
Cal Poly Pomona

On Nov 30, 2020, at 8:41 PM, Albert J. Mallinckrodt <> wrote:

Here is a picture I took a couple of days ago of Ganymede, Callisto, Io, and Jupiter, in that order and with Europa hidden in the disk of Jupiter. (800 mm, f/4, 1600 ISO and 1/2 sec)

It’s important to keep the exposure time under a second or the picture will be degraded by sky motion.