Spacebook
Free website and API from COMSPOC that shows thousands of objects in orbit and lets anyone download orbit, space weather and Earth orientation data.
Why it matters
Free, well-documented orbit data helps small operators, researchers and students who cannot pay for commercial tracking feeds.
How the technology works
Spacebook offers 3D views of orbits powered by Cesium and a download portal for TLEs, enhanced XP-TLEs, synthetic covariance, space weather and Earth orientation parameters, through the web interface or APIs. Data is free without an account.
Sources
Updated Oct 22, 2026 · How we source facts · Suggest a correction