tracking stations coverage

[andrea69 (OP)]

Ok, I think there is still something wrong on the coverage shown in the F3 window.
I'm playing 6.21 now, and I have 5 colonies in the Alpha Centauri system, each one with 2 DSTS (strenght 600).
Three of the colonies are on planets, other two are on moons.
Enabling the "Show passive sensor ranges" checkbox in F3 window, and setting a signature strength of 1000, around the planets with colonies I can see a blue circle around 600 million km, but around the moons there is nothing, no circle at all.

[MarcAFK]

I found these bugs a month ago but didn't have a forum account here to report them, I'll go have a look at what i posted.
"« on: June 16, 2013, 10:47:04 pm »
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.
. . .
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.  "
So, that 700 billion kilometer sensor would be the 26 dsts on earth, meanwhile the 12 tracking stations i had on asteroids had basically the correct range so i didn't notice a problem.
Which tracks perfectly with the chart posted by bgreman. 
TLDR/ I can confirm exactly what bgreman said, also tracking stations on moons don't seem to show a range ring on F3

[alex_brunius]

I can agree with having strong sensory installations on a major planet or colony, but I think DSTS should be... exactly that. Deep space tracking stations. I want my listening posts on the moons of saturn to pick up stuff coming in from deep space. (of course mostly for RP reasons only, and in other very spread out systems listening posts on asteroids or comets in the interstellar gulf could still give you an acceptable early warning system.)

Suggestion for future versions of Aurora:

Reduce detection efficiency on DSTS based on disturbance from same body thermal/EM emissions and atmosphere. Just like on earth astronomers have a very hard time detecting stars.