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Enceladus Flyby - Nov. 21, 2009

Enceladus Flyby - Nov. 21, 2009

Nov. 21, 2009

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Perspective view of Baghdad Sulcus
  This perspective view of Baghdad Sulcus was generated using high resolution images of Enceladus acquired in August 2008 at 12 to 30 meters (40 to 100 feet) resolution, together with a new topographic map of the region produced by Dr. Paul Schenk ( at the Lunar and Planetary Institute in Houston, TX.
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E-8: Cassini Returns to the Tiger Stripes

Just under three weeks after the Enceladus 7 flyby, Cassini once again flew past Enceladus, this time with a very different geometry, approaching within 1,600 kilometers of the surface. The Enceladus 8 (also known as "E8") closest approach occurred Nov. 21, 2009 Spacecraft Event Time (SCET), at a speed of 7.7 kilometers per second at 82 degrees south latitude.

The spacecraft was under thruster control during the flyby to allow for precise tracking of surface features.

The Visible and Infrared Mapping Spectrometer (VIMS) observed Enceladus as the moon emerged from eclipse, followed by a Composit Infrared Spectrometer (CIRS) fast raster scan of Enceladus' night side. The Imaging Science Subsystem (ISS) then took over for high-resolution plume observations obtaining a clear filter mosaic of terrain on the leading hemisphere, providing the best-resolution mosaic so far of that hemisphere. This data can be combined with earlier images of the same region at different geometries to create high-resolution topographic maps, and will be used to look for possible temporal variations in the morphology of the tiger stripes.

CIRS had prime pointing control during closest approach for a high resolution scan of Baghdad Sulcus ¬- one of the tiger stripe features - tracking along the fissure in the south polar region to examine plume sources and producing the highest-ever-resolution contiguous thermal map of this region.

ISS and VIMS then mapped the sunlit surface of Enceladus on departure. The Ultraviolet Imaging Spectrograph (UVIS) performed a long stare for a tenuous atmosphere search, which will provide data to associate plume activity with the quantity of volatiles near Enceladus. Over the following downlink of data, Radio Science (RSS) performed gravity science to better determine Enceladus' mass.

Related Links

Cassini Finds Plethora of Plumes, Hotspots at Enceladus -- Feb. 23, 2010

Cassini Sends Back Images of Enceladus as Winter Nears -- Nov. 21, 2009

Insider's Cassini: Dr. Amanda Hendrix and the Latest on Enceladus -- Nov. 19, 2009

Enceladus at a Glance
Enceladus Flyby
Nov. 21, 2009 (SCET)

1,606 kilometers (998 miles)

7.7 km/sec (17,200 mph)

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