# `archive/src/constants`
This module is the placeholder dataset family for SPICE PCK-style body
constants: gravitational parameters, body radii, and rotation-model data.
## Contents
- `manifest.toml` is a skeleton manifest with no payload entries yet.
- `mod.rs` and `refs.rs` reserve the public Rust module shape.
## Inspect
```bash
sed -n '1,220p' archive/src/constants/manifest.toml
```
## Update
When body-constant payloads are added, place them under this directory, add
`[[files]]` entries to `manifest.toml`, and include source, references,
`sha256`, and `bytes` metadata.
Validate the archive after updating:
```bash
cd archive
cargo run -p archive-validate -- MANIFEST.toml
cargo check --features constants
```
## Use
Enable the `constants` feature. The current module exposes references only
until real PCK-style payloads are migrated.