On Jupiter’s Moons

This is a random setup shot through the 200mm lens where I was using jupiter to set my aim. It’s 1 second f/4 ISO 6400. It amuses me that Jupiter’s moons show so well. If you look at the inset you can see io, Ganymede, and Callisto. I checked against stellarium and they are the right distance from the planet – Callisto being 6′(arc minutes) which translates to 80-odd pixels in the image. The moons are all around magnitude 5 which makes them naked eye visible but I guess without a telescope they’d be lost in Jupiter’s brightness.


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