Neo Radar: A browser-based orbital mechanics engine with 41k real asteroids

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.

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.

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.

Toggle outer-planet gravity on or off. The uncertainty cone widens visibly on Jupiter-flyby trajectories — what mission planners call the keyhole problem.

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.

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.