Enceladus on display in newest images from CassiniMay 3rd, 2012 By Jason Major in Astronomy & Space / Space Exploration
Enceladus' southern ice geysers are brilliant in backlit sunlight. Credit: NASA/JPL/SSI/J. Major
The latest images are in from Saturns very own personal paparazzi, NASAs Cassini spacecraft, fresh from its early morning flyby of the ice-spewing moon Enceladus. And, being its last closeup for the next three years, the little moon didnt disappoint!
The image above is a composite I made from two raw images assembled to show Enceladus in its crescent-lit entirety with jets in full force. The images were rotated to orient the moons southern pole where the jets originate toward the bottom.
Cassini was between 72,090 miles (116,000 km) and 90,000 miles (140,000 km) from Enceladus when these images were acquired.
This mornings E-19 flyby completed a trio of recent close passes by Cassini of the 318-mile (511-km) -wide moon, bringing the spacecraft as low as 46 miles (74 km) above its frozen surface. The goal of the maneuver was to gather data about Enceladus internal mass particularly in the region around its southern pole, where a reservoir of liquid water is thought to reside and also to look for hot spots on its surface that would give more information about its overall energy distribution.
Cassini had previously discovered that Enceladus radiates a surprising amount of heat from its surface, mostly along the tiger stripe features long, deep furrows (sulcae) that gouge its southern hemisphere, they are the source of the water-ice geysers.
Cassini also used the flyby opportunity to study Enceladus gravitational field.
By imaging the moon with backlit lighting from the Sun the highly-reflective ice particles in the jets become visible. More direct lighting reduces the jets visibility in images, which must be exposed for the natural light of the scene or risk blowing out due to Enceladus natural high reflectivity.
The images below are raw spacecraft downloads right from the Cassinis imaging headquarters in Boulder, CO.
Cassini also swung closely by Dione during this mornings flyby but the images from that encounter arent available yet. Stay tuned to Universe Today for more postcards from Saturn!
Provided by Universe Today
"Enceladus on display in newest images from Cassini." May 3rd, 2012. http://phys.org/news/2012-05-enceladus-images-cassini.html