Thanks Alan. Where did you got those? Do you know if the interpolations made to obtain these charts where originally made on an equal-area cartographic plane?

I used Titan24 to generate the orthographic projections from the images you posted after cropping the labels. If you are interested in creating other views Titan24 is available here:
http://www.giss.nasa.gov/tools/titan24/

To use it to view something other than Titan you only need to add a cylindrical projection to the sourcemaps folder.