Suppose that you have a vehicle to be launched at a fixed moment at a fixed location. Then, you want to assess the collision-risk of your vehicle against all space objects. If the vehicle follows its planned spatiotemporal trajectory exactly, it might be sufficient to consider the closest approaching object. However, any flying vehicles have spatiotemporal errors and you need to consider more than one approaching objects. We find the k-nearest objects during your flight in real-time, k>0, from which you can define your own measure of the risk. If you have in-house error model, our report will be more helpful. If you are a serious launcher, you may want to automatically feedback this real-time assessment to your flight control system using vehicle’s telemetry data: We call it LCA-in-the-Loop (LitL, See the Whitepaper).