2017 Galilean Moon Phenomena

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Christopher K.
Posts: 4376
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

2017 Galilean Moon Phenomena

Post by Christopher K. » April 25th, 2017, 8:43 pm

Between 9:26pm and 9:30pm Europa escapes out of Jupiter's shadow and pops up beside Io. At that time Jupiter will be forty-one degrees up in the southeast. At 10:17pm CDT, Io starts to cross Jupiter's face; at 10:42pm CDT Io's shadow follows suit. Both Io and its shadow stay on Jupiter past midnight.

Christopher K.
Posts: 4376
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: 2017 Galilean Moon Phenomena

Post by Christopher K. » May 5th, 2017, 3:07 pm

Wednesday 10 May, ~12:00am to 12:30am CDT

The uninitiated or unknowing can mistake the Galilean moons for background stars. If they saw this upcoming lineup, they could be forgiven! For about a half-hour Ganymede, Io and Callisto form a straight line that will look about forty degrees removed from Jupiter's equator! No, they are not being flung off into the interstellar medium...but it will be a strange sight. Jupiter will be about fifty degrees up in the southwest at this time.

More information:
May 2017 Astronomy, p. 36

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