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SATURN DAILY
Cassini Heads Toward Final Close Encounter with Titan
by Staff Writers
Pasadena CA (JPL) Apr 20, 2017


Cassini will make its final close flyby of Saturn's moon Titan on April 21 (PDT), using its radar to reveal the moon's surface lakes and seas one last time. Image courtesy NASA/JPL-Caltech. For a larger version of this image please go here.

NASA's Cassini spacecraft will make its final close flyby of Saturn's haze-enshrouded moon Titan this weekend. The flyby marks the mission's final opportunity for up-close observations of the lakes and seas of liquid hydrocarbons that spread across the moon's northern polar region, and the last chance to use its powerful radar to pierce the haze and make detailed images of the surface.

Closest approach to Titan is planned for 11:08 p.m. PDT on April 21 (2:08 a.m. EDT April 22). During the encounter, Cassini will pass as close as 608 miles (979 kilometers) above Titan's surface at a speed of about 13,000 mph (21,000 kph).

The flyby is also the gateway to Cassini's Grand Finale - a final set of 22 orbits that pass between the planet and its rings, ending with a plunge into Saturn on Sept. 15 that will end the mission.

During the close pass on April 21, Titan's gravity will bend Cassini's orbit around Saturn, shrinking it slightly, so that instead of passing just outside the rings, the spacecraft will begin its finale dives which pass just inside the rings.

The flyby is Cassini's 127th targeted encounter with Titan. A targeted flyby is one for which the spacecraft uses its rocket engine or thrusters to accurately aim toward the encounter.

Cassini's radar instrument will look for changes in Titan's methane lakes and seas, and attempt for the first (and last) time to study the depth and composition of Titan's smaller lakes.

The radar instrument will also search a final time for Titan's "magic island," a mysterious feature in one of the moon's seas that changed in appearance over the course of several flybys.

Scientists hope to gain additional insights to help them determine whether the feature is waves, bubbles, floating debris, or something else entirely.

More information about Cassini's final Titan flyby is available here

SATURN DAILY
Saturn moon has necessary conditions to harbor life: NASA
Washington (AFP) April 13, 2017
An ice-encrusted moon orbiting Saturn appears to have the conditions necessary for life, NASA announced Thursday, unveiling new findings made by its unmanned Cassini spacecraft. Cassini has detected hydrogen molecules in vapor plumes emanating from cracks in the surface of Enceladus, a small ocean moon coated in a thick layer of ice, the US space agency said. The plumes have led scientis ... read more

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