Not sure what "subdwarf" means >: Like body? But then main star must be huge O/B like and list is short.
For API limit was 100ly around, so doing next:
Center: Sol
Radius: 100ly
Main star: M dwarf
Must have at least 3 giants.
Why are you filtering on “must have at least 3 GG”?
If I remember the star classifications correctly “subdwarf” would be a type M VI ( that matches the codex pic after colour correction to make the rear station lights match those of Aulin Enterprise), however it might be safer to filter on any M type regardless of subtype. I guess within a 150ly radius of Sol since the Wiki says that is the size of the bubble.
AHTW says:
“Robert pursed his lips, studying for movement. He’d never visited this planetary system. It registered explored on the maps, but was sufficiently far from civilisation to be of little interest; a common-as-hydrogen red dwarf star, an asteroid field behind them and a blue-green gas giant hovering in space ahead. And apparently orbiting the gas giant was Gunn’s Circle base” ... and later on in chapter 13 “the station’s rotation created Imperial standard gravity”
I don’t know if that means there is only an M type, asteroid belt, and a single Type3 GG in the system, or whether there are other planets. I suspect only a single GG in such a system would be very unusual? I’m also assuming the quote means a Type 3 GG from Sudarsky’s classification (https://en.m.wikipedia.org/wiki/Sudarsky's_gas_giant_classification).
Edit: noting the statement about the station’s gravity level it might perhaps be sensible to filter on a radius around Achenar?
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