Archive for April 10, 2017

04/10/2017 – Ephemeris – Jupiter takes over as king of the evening sky

April 10, 2017 Comments off

Ephemeris for Monday, April 10th.  The Sun will rise at 7:06.  It’ll be up for 13 hours and 14 minutes, setting at 8:21.  The Moon, 1 day before full, will set at 7:36 tomorrow morning.

By the time we see the Moon tonight it will be about 5 hours from officially being full.  However bright planet Jupiter should be easily visible about 5 moon diameters to the right and a bit above the Moon.  In a small telescope it is easy to see the disk of Jupiter, and possible see the cloud bands in the atmosphere,  due to the planet’s rapid rotation, of less than 10 hours.  Jupiter’s mass is over 300 times the Earth’s, while one could squeeze over a thousand Earth’s into its volume.  Jupiter has something like 67 satellites,  but only for are visible in small to medium telescopes.  Tonight they will be strung out all on one side of Jupiter, tomorrow night two will be on the other side of the planet, and another will be playing peek-a-boo in front of Jupiter.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.



Jupiter on two nights

Jupiter and its moons in a telescope at 10 p.m. both April 10th & 11th, 2017. Created using Cartes du Ciel (Sky Charts).

Event Date & Time EDT Date & Time UT
Io Occultation Start 10 April 2017 10:31 p.m. 11 April 2017 2:31
Io Eclipse ends 11 April 2017 12:28 a.m. 11 April 2017 4:46
Ganymede Occultation start 11 April 2017 4:28 a.m. 11 April 2017 8:28
Ganymede Eclipse end Not visible 11 April 2017 11:02
Europa Occultation start Not visible 11 April 2017 18:44
Europa Eclipse ends Not visible 11 April 2017 21:19
Io Transit starts Not visible 11 April 2017 23:48
Io Shadow ingress Not visible 11 April 2017 23:54
Io Transit ends 11 April 2017 8:58 p.m. 12 April 2017 1:58
Io Shadow egress 11 April 2017 10:05 p.m. 12 April 2017 2:05

Where times EDT show as not visible, Jupiter is below the horizon.  Date and time UT are for observers in other locations.  UT is Universal Time, or Greenwich Mean Time.

Occultation = moon passes behind Jupiter
Eclipse = moon in Jupiter’s shadow
Transit = moon passes in front of Jupiter
Shadow = moon’s shadow is cast on the face of Jupiter