Physics sandbox

Orbital Lab

A computational-physics simulator for orbital mechanics, numerical methods, and scientific visualization.

Simulation

Model

Seed Preset Integrator Collision mode

Parameters

Gravity Constant1.00

Timestep0.020

Central Mass9000

Trail Length90

Softening25

Zoom1.00×

Adaptive timestep

Adaptive strength1.2×

View

Show trails Show velocity vectors Show labels

Live metrics

Bodies0Active objects

Time0.00Simulation units

Energy drift0.0000%Relative to start

Momentum0.00Total linear momentum

Angular momentum0.00Scalar z-component

COM0, 0Mass-weighted position

Closest approach0.00Minimum pair distance

Max speed0.00Fastest body

Orbital elements

Semi-major axis—Estimated from specific energy

Eccentricity—Relative orbit shape

Period—Bound orbit only

Periapsis—Closest approach estimate

Apoapsis—Farthest approach estimate

Escape speed—Local escape velocity

Specific energy—Two-body orbital energy

Benchmark report

Press “Run Benchmark” to compare all integrators on the current initial conditions.

Notes

Drag on the canvas to launch a new body. Mouse wheel controls zoom. Space toggles play/pause. R resets. E exports CSV. P saves a PNG snapshot. B runs the benchmark. Shift+S exports a reproducibility bundle. Shift+L reloads the saved session. Shift+X clears it. ? opens the shortcut guide.

RunningSymplectic Euler · Default System

Time0.00sim units

Launch gesture: click-drag-release to spawn a body with velocity from your drag vector.

Adaptive stepping increases stability during close encounters. The benchmark panel compares integrators on the same initial conditions. Your control state is saved automatically in this browser.