Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p21a1347r&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P21A-1347
Other
5464 Remote Sensing, 5494 Instruments And Techniques, 6281 Titan
Scientific paper
Cassini completed its four year Prime Mission in July, 2008. This included a total of 45 close Titan flybys, with radar data obtained on 23 of these. An approved two year extended mission will provide an additional 25 close Titan flybys, with radar data collected on 12 of these. The prime mission radar data covered primarily the northern hemisphere of Titan, and the priority for the extended mission radar observations will be to fill in southern hemisphere coverage and provide limited repeat coverage for change detection in the north. During the prime mission, all but one flyby included some form of synthetic aperture imaging, leading to a wide range of viewing geometries. Imaging resolution varied from 300-500 m at the closest approach altitudes (1000 km) to about 2 km during high altitude (20,000 km) imaging segments. Altimetry, scatterometry, and radiometry mode data were also collected over multiple geometries to sample Titan's scattering and emission functions. The varying geometry and instrument parameters, which lead to varying resolution, SNR, polarization, incidence angle and noise characteristics, must be properly accounted for when interpreting these data. Here we review the coverage and other important characteristics of the radar data sets obtained at Titan in the prime mission, and compare these with plans for the extended mission. The first extended mission radar observation will occur on Dec 5, 2008, and we will present these timely preliminary results if the spacecraft operates as planned. Prime mission data along with corresponding surface coverage from ISS and VIMS have revealed a diverse Titan surface, which will be further augmented and analyzed by extended mission results. This work is supported by the NASA Cassini Program at JPL - Caltech.
Anderson Y.
Callahan Philip
Gim Yonggyu
Hamilton Gina
Janssen Martin
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