Given the new hint, can we make this a concerted / group effort? List all the Nebula, systems within as well as the planets which people have visited (and how many POI perhaps?) I don't have enough time, but perhaps someone could start a new thread and keep updating the first post with everyone's data?
A start: http://i.imgur.com/tbYUzFF.jpg
Pleiades Nebula
Witch Head Nebula
North America Nebula
California Nebula
Pelican Nebula
Orion Nebula
Horse Head Nebula
Veil Nebula East
Etc.
An approach I'll be taking is to try the systems whose names are more easy to write rather than those with jumbled numbers and letters. Looking forward to searching once again and good luck to all!
Check this out