Add a completion bonus for all systems. When you turn in "first discovered" data for the final body recorded in a system and complete the dataset, award a completion bonus based on the distance of that body from the center of the system and possibly also the number of bodies in the system.
There are a lot of bodies no one has ever visited because they are so far away that it isn't worth waiting 5 minutes to scan an icy body based on the payout. This would give explorers an incentive to help provide complete cartographic data on systems.
A payout for the first person to land on a landable body would also encourage explorers to be more thorough instead of the standard honk, selectively scan, and jump.
There are a lot of bodies no one has ever visited because they are so far away that it isn't worth waiting 5 minutes to scan an icy body based on the payout. This would give explorers an incentive to help provide complete cartographic data on systems.
A payout for the first person to land on a landable body would also encourage explorers to be more thorough instead of the standard honk, selectively scan, and jump.