New Cassini CIRS Observations of Temperatures on Iapetus and Other Saturnian Satellites

Details New Cassini CIRS Observations of Temperatures on Iapetus and Other Saturnian Satellites New Cassini CIRS Observations of Temperatures on Iapetus and Other Saturnian Satellites

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.0608s&link_type=abstract

American Astronomical Society, DPS meeting #39, #6.08; Bulletin of the American Astronomical Society, Vol. 39, p.419

Astronomy and Astrophysics

Astronomy

Scientific paper

The Composite Infrared Spectrometer (CIRS) on the Cassini spacecraft has continued its survey of thermal emission from Saturn's icy satellites, mapping both daytime and nighttime temperatures in order to constrain surface thermal inertia and its spatial variations, and to look for signs of endogenic heat. There have been several notable observations in the past year. In November 2006 CIRS obtained its first view of the active south pole of Enceladus since the discovery of activity in July 2005, and found that the power, temperature, and spatial distribution of the endogenic thermal emission had changed little in the intervening 16 months. A Tethys flyby in June 2007 provided the second close view of daytime and nighttime temperatures on that moon, and included a measurement of temperatures at the north pole, which has been in darkness for the past 12 years. A flyby of Iapetus on September 10th 2007 will provide high-resolution maps of thermal emission from the dark leading hemisphere at night, and from the bright terrain and the bright/dark transitional region on the trailing hemisphere during the day. When combined with daytime observations of the dark hemisphere from January 2005

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