Hotspots - where do they come from?

This is a genuine question, which I haven't seen answered sufficiently - if it has been answered, could someone please point me at it? Thank you.
I understand they are generated, and I know how they work in-game. No problem with any of that.
My question is :
Do we know the type of information that determines their generation?
All I know is 'icy ring'.
Rings around different types of planets - affect?
Rings in systems of different star-types - affect?
Given my playstyle - free-range with an eye to gentle mining/profiteering (and the need for Tritium), I'd like to filter my search criteria a little, and any snippets that change the odds my way is welcome :)
I think there's a group outside the forums where this question may be asked more relevantly, but I can't find it.

o7
 
As far as I know "Icy Rings" sums it up. I would love to hear if there's a better answer, but I suspect that's pretty much it.
 
Good answer, thanks.
Oh well.
FD - can I at least get paid for finding hotspots pls?
I'll publish any interesting overlaps I find - they're not that common.
o7
 
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