139 asteroids are passing through
Earth's neighborhood this month.
NEO Radar is a real orbital-mechanics engine for tracking Near-Earth Objects.
47 high-fidelity objects with full RK4 N-body dynamics, plus 41,812 MPC catalog
asteroids with real positions — all 8 planets simulated. Click any asteroid for
a complete physical dossier.
Real physics. Not approximations.
Every trajectory in NEO Radar is integrated from JPL Horizons ephemeris with full
gravitational perturbation from the outer planets. The numbers you see are the
numbers a mission planner would see.
Solves Kepler's equation, not lookup tables.
Mean anomaly to eccentric anomaly via Newton-Raphson with adaptive seed,
converging to 1×10⁻¹² in under four iterations even for high-eccentricity orbits.
Jupiter and Saturn pulled, and you see the pull.
Toggle outer-planet gravity on or off. The uncertainty cone widens visibly
on Jupiter-flyby trajectories — what mission planners call the keyhole problem.
JPL Horizons ephemeris, locally cached.
Pulled directly from JPL Horizons and pinned to disk for instant access. Observation
arcs and uncertainty parameters travel with every object — no approximations, no drift.
How accurate is it?
We benchmark every NEO Radar trajectory against JPL Horizons ephemeris over a
50-year window. Where simplified two-body models drift by tens of thousands of
kilometers, NEO Radar stays inside the actual uncertainty cone.
Position accuracy is computed as RMS deviation from JPL ground truth across the
same 50-year window for the 47 high-fidelity objects.