QUOTE (Bjorn Jonsson @ Jul 30 2005, 09:06 PM)
This would have been difficult to do since Cassini doesn't have a steerable platform for the remote sensing instrument so the entire spacecraft has to be rotated to point the instruments at specific targets. How the spacecraft could be pointed at Venus was highly constrained by the fact that the high gain antenna had to act as a sunshade by pointing at the sun.
Basically, it could have been done if money had been allocated and software had been written before the mission. But to save costs, much of Cassini's flight software was written after launch, and it was using pretty early versions at the time. Had elaborate planning to be done to make sure that nothing was pointed at the sun that shouldn't be and or for too long, which would be a very complex task at Venus for a spacecraft designed to operate at Saturn, some observations could have been made. But this would have taken a lot of planning money, and with the software not being fully tested yet, too much of a risk. Better to miss out on some Venus data than blind the spacecraft years before SOI!