Archive for June 12, 2017

06/12/2017 – Ephemeris – Now is a great time to view Saturn

June 12, 2017 Comments off

Ephemeris for Monday, June 12th. Today the Sun will be up for 15 hours and 31 minutes, setting at 9:28, and it will rise tomorrow at 5:56. The Moon, 3 days past full, will rise at 11:44 this evening.

In three days the planet Saturn will be opposite the Sun in the sky. Astronomers simply call it opposition. It’s the time Saturn will be closest to us, and appear biggest in telescopes. That’s not a big a deal as for a closer, smaller planet like Mars or Venus. Being ten times farther from the Sun than the Earth Saturn’s distance and thus it’s size varies by only plus or minus 10%. Another event happened on Saturn last month, Summer started in it’s northern hemisphere. Saturn’s rings orbit the planet over it’s equator, and Saturn’s axial tilt of obliquity is 26 degrees, similar to the Earth’s actually. This summer solstice means that the rings are at their most open because we are viewing Saturn from near the Sun, so a first glance through a telescope Saturn looks elliptical, with the planetary ball completely within the rings.

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


Saturn's Rings over time

Saturn’s Rings over time as they closed. Credit NASA/HST/WFPC2

Now the rings are opened to their maximum extent with the northern hemisphere of Saturn uncovered by the rings and the southern hemisphere covered by them, the reverse of the top image.

Categories: Ephemeris Program, Saturn