View Single Post
Old 03-29-2009, 12:58 AM   #5
Avalon Senior Member
Join Date: Sep 2008
Location: So. Cal. U.S.
Posts: 4,205
Default Re: Sky Calendar -- April 2009

Here you go.............

Four of Saturn's moons parade by their parent

17 March 2009
A new Hubble image shows four of Saturn's moons circling the ringed planet.

On 24 February 2009, the NASA/ESA Hubble Space Telescope captured a photo sequence of four moons of Saturn passing in front of their parent planet. The moons, from far left to right, are the white icy moons Enceladus and Dione, the large orange moon Titan, and icy Mimas. Due to the angle of the Sun, they are each preceded by their own shadow.
These rare moon transits only happen when the tilt of Saturn's ring plane is nearly edge-on as seen from the Earth. Saturn's rings will be perfectly edge on to our line of sight on 10 August and 4 September 2009. Unfortunately, Saturn will be too close to the Sun to be seen by viewers on Earth at that time. This ring-plane crossing occurs every 14-15 years. In 1995-96 Hubble witnessed the previous ring plane crossing, as well as many moon transits, and helped to discover several new moons of Saturn.

Dantheman62 is offline   Reply With Quote