The New Mission: Strange New Worlds, I believe from Admiral Quinn?? States that player should do THREE Explore Missions, in some given, or no specific Sector. Yesterday, it told me to go to Hromi, and today, it left location Optional, and I did it in Delta Volanis.
The Pay Out of 1440 ORE, in the Mission Text, says to do THREE Explore Missions, then Hail HQ for Pay. After completing ONE Explore Mission, Pay is Available to get. Somewhat of an Exploit.
Can confirm this too.
Most of the time its need only one Mission to complete.
My first though was, that its have something to do with the Diplomatic Investigations but its the same if you do it normal in any Cluster.