Add moon scripts

generate-moon-assets/README.md

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+# Generate Moon Assets
+
+Python scripts that generate [OpenSpace](https://www.openspaceproject.com/) `.asset` files for Saturn's minor moons, using SPICE kernel data from JPL.
+
+## Scripts
+
+### `generatemoonassets.py`
+
+Generates OpenSpace asset files for recently discovered Saturn moons. For each moon it creates:
+
+- A **RenderableGlobe** scene graph node (body)
+- A **RenderableTrailOrbit** (orbital trail)
+- A **RenderableLabel** (text label, disabled by default)
+
+All objects are parented to `SaturnBarycenter` and placed under `/Solar System/Planets/Saturn/Minor Moons/<Group> Group/` in the GUI.
+
+The script contains two ID blocks mapping provisional moon designations to SPICE kernel IDs:
+
+| Block | IDs | SPICE Kernel | Description |
+|-------|-----|--------------|-------------|
+| `id_block2` | 65094 -- 65157 | `kernels454` (SAT453) | May 2023 discoveries |
+| `id_block` | 65158 -- 65285 | `kernels455` | March 2025 discoveries |
+
+The active block (`id_block`, parsed on line 225) is split into two output files to keep asset sizes manageable (e.g. `march_2025_discoveries-1.asset` and `march_2025_discoveries-2.asset`). To switch batches, change line 225 to parse `id_block2` instead.
+
+### `lookuptable.py`
+
+A data module exporting a `saturn_moons` dictionary with physical and orbital properties for ~288 Saturn moons. Each entry contains:
+
+- **group** -- dynamical family (e.g. Norse (Mundilfari), Inuit (Kiviuq), Gallic, inner ring)
+- **orbital_period_days** -- orbital period in days (negative values indicate retrograde orbits)
+- **diameter_km** -- approximate diameter in km
+
+Groups covered: inner/regular moons, co-orbital, ring-embedded, trojans, Inuit, Gallic, and Norse (with sub-groups Mundilfari, Phoebe, Kari, low-inclination).
+
+When run standalone it prints a summary table of all moons sorted by orbital period.
+
+## Usage
+
+```bash
+python generatemoonassets.py
+```
+
+This writes two `.asset` files in the current directory. Place them in the appropriate OpenSpace data folder alongside the referenced SPICE kernel and transforms assets.
+
+## Dependencies
+
+- Python 3.6+ (f-strings)
+- No external packages