What you can place
The object catalog covers everything from rocky moons to supermassive black holes, with realistic mass ranges and visual presets.
- Planets — terrestrial, gas giant, or fully custom, with diameter, mass, and surface color you control.
- Moons — pick from a preset catalog or define your own and attach them to any existing body.
- Stars — main-sequence presets with realistic temperature, color, and luminosity, or a custom temperature in Kelvin.
- Black holes — define mass and Schwarzschild radius and watch nearby orbits warp.
Drop, drag, and adjust
Drag any object out of the catalog into the scene. Orbitarius automatically computes a stable orbital velocity for the position you drop it at, relative to whichever body it would naturally orbit, so you do not need to do the math yourself. You can also disable the auto-velocity and place a body at rest if you want to see it fall in.
Replay and experiment
Pause, scrub time, accelerate, change initial conditions, restart from scratch. Trails and orbit lines let you see whether what you built is actually stable or slowly unraveling. Add a second star and watch the binary geometry confuse a planet that was originally in a clean ellipse. Remove the central star and watch the rest of the system fly apart.
Frequently asked questions
- Is the gravity real or simplified?
- It is Newtonian gravity integrated per frame, the same as the Solar System view. There is no relativistic correction, but for everything short of orbiting very close to a black hole, the difference is invisible.
- Can I save my custom system?
- Saving and loading is on the roadmap. For now, what you build lives in the current browser tab.
- What happens if two bodies collide?
- Currently bodies pass through each other — collision response is intentionally not modeled so you can study close encounters without losing the bodies.