advanced disco scanner is best bet,
this is common, and sometime the data is not available to buy, when doing long range smuggling mission or shadow style mission it is common to get mission for systems that have no data and the only way to find your destination is to scan (this actually applies to any mission for planets now because there are so many new ones added with horizons that that data is not actually present even when you by the data for a system)
several systems I bought data for got there and scanned and still discovered up to 48 other new items in that system.
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You might see the orbital stations without planets but you need to discover the planets to find surface bases. There is no guarantee that you will find them without an advanced discovery scanner.
agreed, some planets could be on a secondary star and be 38 - 68000ls away you'd never find by flying around honking the basic scanner and hoping for the best, one of my undiscovered delivery point last night for a mission was planetside 89000ls from the primary star orbiting a trinary star.