Space Debris & Satellite Collision Tracker
Live conjunction screening of all tracked objects — close approaches updated every 4 hours. Powered by our open-source Rust library wgpu_sgp4 [how it works]
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Parameters
Initializing WebGPU...
Controls
Distance over time
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Architecture
For each bucket window [T, T+bucket]:
1. CPU: SGP4 propagate all sats at T and T+bucket (reuse previous T+bucket as new T)
2. GPU: SLERP interpolate positions at 1-second intervals → cell entries
3. GPU: Radix sort entries by (time_offset << 26) | cell_id
4. GPU: Collision detection on sorted entries → candidate pairs
5. CPU: Refine TCA for unique pairs using linear algebra root find/rejection
Data flow (GPU buffers, no CPU roundtrip until final pairs):
positions_t0[28k] → Interp shader → entries[28k×bucket] → RadixSort → Detection → pairs[]
positions_t1[28k] ↗About Space Debris Tracking
There are over 30,000 tracked objects in Earth orbit, and the risk of collision grows as more satellites launch each year. This tool screens the entire satellite catalogue for close approaches — conjunctions where two objects pass within a few kilometres of each other. Results are computed every 4 hours using GPU-accelerated SGP4 propagation and shown here in real-time. You can also run your own conjunction search directly in the browser using WebGPU. See also: satellite re-entries and Starlink satellite tracker.