As an update to my exploration run back to the bubble I just did something really silly.
I decided this time to get as clsoe as possible to the back side of Barnad's Loop, well to me it's the back side because I have always passed it the other side, Witch Head etc. Anyway I was cruising down to a bio feature on a planet and lost track of it, but instead of just hitting all stop and looking around I thought to myself "it must be below me" and as you do just pointed the nose directly down, followed immediately by the thought, "hmm, I didn't realise I was that close to the ground!"
Now I am back at Thor's Helmet in the Sagan Research Centre deciding what to do, all that data, all those codex rewards, all gone. So I shall set my course following "visited systems" and do it all again, will be a bit quicker this time, I will grab the uniques but not visit every bio site I did previously, so be a day or two before I get back to "that" world where I will take up my exploration anew. It's a pity we can't eject a data package to the planetary surface to be picked up, while I am not for all data being preserved on ship death, that would make it to easy, having to fly back to pick up your data seems enough punishment, specially for the distant trips, close ones most people would probably ignore.
Anyway, so it will be that little bit longer before I buy my Phantom, that's life I guess.