Monday, May 22, 2017

Jupiter and the Galilean Moons

I happen to be out in my backyard this weekend during that sliver of time when the sky is dark enough to see Jupiter with the unaided eye, but not so dark that the sky is black yet.  Unlike the moon, which is usually visible during most daylight hours, the planets are difficult to spot against a blue sky except at dawn and dusk.  I managed to snap the following picture that also shows the Galilean moons.



I did cheat just a little.  I took a long exposure, which made the sky bluer in the picture than it looked to the unaided eye.  The long exposure is revealed if you click on the picture to enlarge it.  You'll see the motion blur from the Earth's rotation.  I don't have a tracking mount, so I still get "star trails" when I take long exposures at high magnification.