The file "Prefs.txt" in the "Starry Night (Pro or Enthusiast or Digital Download)-Sky Data-Prefs" folder has fields named "MaxNumOf Asteroids", "MaxNumOfComets", "MaxNumOfSatellites" and Starry Night will only read in a number of objects equal to the values in these fields. You can change the values of these fields to read in more objects (this may slow the program down if you read in too many objects).