Each time that you select a star, it will show three rings.
The small dotted ring is simply a selection ring for that star.
The dashed wavy ring is that empire’s scan range from that star.
All stars that are within scan range will have a bright white center core.
Stars that are outside scan range will have a dark center core.
The solid wavy ring is that empire’s hyperspace range from that star.
When a carrier is selected, shortcut key “W” will enter Waypoint edit mode. Potential destination stars within Hypersapce Range will have small bright wavy rings. Up to 19 waypoints may be scheduled for a carrier.
Stars outside of HR will be unselectable for that carrier from the current waypoint.
When a star is near the edge of a ring, it can be difficult to see, and tell the distance.
Shortcut key “V” provides a chain ruler to measure distances for a carrier flight path through multiple stars and way points.
If you are still not sure, then you can measure the distance between two stars x10 to increase the resolution and allow you to read the next smaller digit of accuracy.