04/11/2017 – Ephemeris – What’s under Jupiter’s cloud tops?
Ephemeris for Tuesday, April 11th. The Sun will rise at 7:04. It’ll be up for 13 hours and 17 minutes, setting at 8:22. The Moon, at full today, will rise at 8:54 this evening.
I made an error in yesterday’s on-air program which I fixed before posting this blog version. The moon Io will be over the face of Jupiter from when it rises tonight until 8:58 p.m.*, thereafter it will be seen just to the west of the planet. What we see of Jupiter are its cloud tops. Planetary astronomers have some very educated guesses as to what lies beneath them. An atmosphere of mainly hydrogen and helium, ending in a hot liquid ocean of hydrogen. Beneath that a core of metallic hydrogen that generates the planet’s huge magnetic field. Below that maybe a core of solid iron and other metals. NASA’s Juno spacecraft now orbiting Jupiter is tasked with finding out the interior structure by measuring the velocity of the spacecraft as it flies just above the cloud tops of this giant planet.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
* Observers in other locations around the world can check out the table from yesterday’s post of other Jovian satellite events after this entry is posted at 4:01 UT, April 11, 2017.
For a year’s worth of Jovian satellite events and when the Great Red Spot crosses Jupiter’s central meridian, go to: http://www.projectpluto.com/jevent.htm.