I just found this picture on the internet and wanted to share it with you. Maybe some of you will find your "next best nebula" more easily. Enjoy!
Also, I have opened a thread on the Elite Forums to discuss the apparent inconsistency of FDev in denominating interstellar objects, which can make it a PITA to locate your favorite postcard nebula in the game. Discuss, if you like to https://forums.frontier.co.uk/showthread.php?t=150164
As always, fly safe!