Need help of Vanilla quest of 'Abyssal Space Oddity'

This quest ask me to find a sensor array in a system named Dargon, but when i arrive there, there is no sensor array in that system. There is nay buoy and comma array but do not have sensor array, only a stable location. Maybe it has been salvaged by me before the quest, but if this is true, how could i complete or forfeit this quest?