LIVE OBSERVATION
Grand design spiral
Rotation curve
UFF empirical v4UFF demonstration data · fixed parameters, no fit. Shaded ends extend the supplied component speeds beyond 0.5–12 kpc.
Compare the six demo rows
| Radius (kpc) | Demo ± error (km/s) | Model (km/s) |
|---|---|---|
| 0.5 | 40 ± 5 | — |
| 1.0 | 65 ± 5 | — |
| 2.0 | 90 ± 4 | — |
| 5.0 | 115 ± 4 | — |
| 8.0 | 130 ± 6 | — |
| 12.0 | 135 ± 7 | — |
Preparing the deterministic star field.
About this galaxy
The UFF modes use gas, disc and bulge component curves to calculate circular speeds, with a selectable halo or acceleration law and an optional central mass. Those speeds drive the stars’ orbits. The original visual mode retains its adjustable shear.
The star distribution remains an authored disc, bulge and halo. Morphology controls change that display geometry; mass-to-light controls change the dynamics. Logical stars describe a sampled population. Only the rendered count is drawn.
UFF’s demo table is an included example, not an identified observational catalogue. Source equations and model definitions ↗