Powerplay A quick question - How is the preparation list populated?

How is the preparation list populated? Starts out with 3-4 systems at day one of a cycle, a day later it lists 10 systems? Who decides which end up in the list? The sim or players? If player, how so?
 
It's a list of the top ten preparation targets, sorted by number of merits and with a lower limit of 50 merits to make it onto the list.
 
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