Seems the coordinates are useless after one of the last couple of updates. I can only find Level 1 planets right now. Keep in mind new finds may also reset at some point during this early access.
threat levels changed. alpha is threat level 1 (old lvl 1-10), beta is threat level 2 (11-20) and so on.
This one is even better, someone made them into spreadsheet.
community.playstarbound.com/index.php?threads/unified-coordinates-spreadsheet.37543/
Great find. Thank for for sharing!