Thanks for the prompt reply! I was confused because I missed the tiny green spots on Minotaur and I had heard that some GGGs don't trigger the codex event.
Sure, those are Green Gas Giants with Water-based Life. The Codex is bugged for those and they won't register. You wrote that yours is a Class III gas giant instead, for which the Codex works fine, so if yours were a GGG, the Codex would have popped.
You also wrote earlier that the description didn't have the extra parts ("this particular" and so on) that all GGGs have. That's what you should look for. If it's there, the game recognizes it as a GGG. If it isn't, then it doesn't.
Oh, and something else that's good to know: in the Galactic Centre and Ryker's Hope regions, all GGGs spawn Notable Stellar Phenomena (K10-Type Anomalies). So that's a quick way of telling if there's one in the system.
Also is there a way to lookup the surface temp down to six decimals without travelling there and browsing the log file?
If memory serves, Orvidius recently changed
EDAstro's processed data to have the correct precision. (Also to fix some problems with zeros.) You can look things up at
https://edastro.com/mapcharts/files.html.