It seems that none of the systems in the map have system data (which is to be expected way out there). So how do you plan your route to avoid running into a string of brown dwarfs and running out of fuel?
Although they don't have system data, they do have stellar data.
If you switch the Galaxy Map panel to the Info tab, and then move your mouse over any star, the panels shows all the stellar types in that system.
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Rocky and icy planets are rubbish.
Interestingly, it looks like (at least) icy planets do not follow the 1X, 2X, 3X value progression that stars do of discovery, basic scan, detailed scan.
You can predict pretty accurately which planets will be icy from the system map, and over many many systems, the average value of a discovered but unscanned icy world is ~250, but the value of a fully scanned one is only ~500.
By comparison, a main sequence star would go from ~200 to ~1200.
eg.
COL 285 Sector GM-L B8-0 - Main sequence plus 3 unscanned (presumed icy) worlds. 1200 + 3*250 = 1950. Actual value 1955.
COL 285 Sector NS-J B9-1 - Main sequence plus 6 unscanned (presumed icy) worlds. 1200 + 6*250 = 2700. Actual value 2704.
Arietis Sector XJ-R B4-1 - Main sequence plus 4 unscanned (presumed icy) worlds. 1200 + 4*250 = 2200. Actual value 2706.
vs
COL 285 Sector VP-D B7-1 - Main sequence plus 1 scanned icy world. 1200 + 500 = 1700. Actual value 1761.
By comparison, scanned rocky or rocky/icy worlds seem to only be worth around 100. Not sure on that figure yet.