Orbital debris catalogue, risk zones, and watch object tracking
Total Tracked
27,432
catalogued objects
High-Risk Objects
127
size/orbit classified
Recent Additions
+23
in latest update
Risk Score
38
/100 prototype score
Altitude: 400–600 km
8,921
objects
The 400–600 km altitude band hosts the ISS, Starlink megaconstellation, and historic debris from Fengyun-1C (2007 ASAT) and Iridium-Cosmos collision (2009). This region experiences high conjunction rates.
Watch Objects
Altitude: 600–800 km
4,213
objects
Popular for Earth observation satellites. Growing congestion from commercial remote sensing constellations. Moderate conjunction activity reported.
Watch Objects
Altitude: 19,000–24,000 km
312
objects
Medium Earth Orbit hosts GPS, GLONASS, Galileo, and BeiDou navigation satellites. Relatively sparse, low conjunction risk.
Altitude: 35,786–35,786 km
1,892
objects
The GEO belt at 35,786 km is uniquely congested due to the finite number of orbital slots. Station-keeping failures create 'zombie satellites' drifting through active slots.
Watch Objects
2007
Fengyun-1C ASAT Test (China)
criticalLargest single debris-generating event in history. Fragments still in orbit.
2009
Iridium 33 / Cosmos 2251 Collision
criticalFirst accidental hypervelocity collision between intact spacecraft.
2021
Cosmos 1408 ASAT Test (Russia)
elevatedCreated debris cloud crossing ISS orbit. Crew sheltered multiple times.
2019
Mission Shakti ASAT Test (India)
moderateMost debris decayed within months due to low altitude. Limited long-term risk.