Accept Professional Assassination mission at mission board in a station/outpost.
Get in my ship and Launch.
As soon as I launch, I get an in-game mail saying, "Mission Alert: Target Fleeing. Commander, The target made a break for it. Fortunately, I pulled a few strings to ensure they didn't get far. I'm sending you the new location now. Make sure they don't get away."
At the bottom of that message it says, "Mission Details - Target Body: Currently Unknown. Scan Required."
So I honk the system - nothing.
I go to the Nav Beacon and scan it - nothing.
I jump into FSS - every planet/signal that I can find is revealed - nothing.
I head to the planet that was the original target, land at the base and search their terminal for the target - nothing.
I pull up the Navigation menu - nothing.
I Look at the Contacts menu - nothing.
Pulling up the Mission in the Transaction screen, it says "Mission Details - Target Body: Currently Unknown. Scan Required"
I've done a lot of these. When they flee, two things can happen:
- It can actually tell the planetary body they are on
- Or it can say "Target Body: Currently Unknown. Scan Required" as your did.
If it says number 2, I would recommend going to the system's nav beacon and scanning it. That should resolve the planetary body.
Once you know the planetary body, just fly to it and get real close (sometime to the point of about to do planetary entry). In the nave panel, you should see a blue (mission color) planetary nav point labeled "Encrypted signal". Head straight for that.
Land somewhere nearby - preferably at least 300m or more away so you can get the drop on them. Your target will be walking around near his parked, or crashed, ship - usually a sidewinder or eagle. No guards, easy to kill. You can also loot the box and (if wearing a maverick suit) you should be able to cut into the ship panels (bottom of each wing on the Eagle) and possible retrieve a good power regulator as well as other components.
I absolutely LOVE this complication as it almost always means my job just got a LOT easier and there is bonus loot to be had.