I've discovered an interesting Sensor or display bug, In my newly started game I have decided to set up Small tracking station/missile bases around Uranus's orbital path. They will need Sensors with around 3 Billion Kilometers each to provide adequate coverage, at start I'll just use Deep space tracking stations as they provide good passive detection range, and are upgradable linearly.
I've selected asteroids Asbolus, Crantor and Chariklo which have close to 120 degree seperation around the path and similar orbital peroids, of 63, 77 and 85 years, though eventually after a few decades there will be gaps in coverage, I could easily move the facilities to new nearby asteroids. Each will need 12 deep space tracking stations to provide the coverage I'll need, I should note that merely putting those 36 Tracking stations on Earth would provide double coverage, out to 9 billion Kilometers. Anyway, Using the passive sensor tab on the System Map to check the tracking coverage has shown a few anomalies, Firstly theres an unknown passive sensor radius extending out to 700 billion kilometers for a strength 100 contact (?) and secondly if i put one of the tracking stations around a Uranian moon, no tracking radius shows up on the map at all.
Lastly I'm not sure what the 'signature detection range' option does as my deep space tracking stations don't produce any red radius, whereas all my ships equipped with thermal sensors do, but the wiki says that deep space tracking stations detect electro-magnetic and thermal emissions.
Just a few things causing a little confusion to me, I'm considering setting up a small scenario with an player controlled race to test if a base at a Uranian moon would still produce detection, but for now i'll use Chariklo as it's position is currently a little better than Uranus.