Your first crossmatch¶

Stub. This notebook is part of the documentation scaffold. The final version will walk through a real Gaia DR3 × 2MASS crossmatch over a small sky region, with plots.

Planned flow:

1. Download a small Gaia DR3 and 2MASS subset over a ~2 deg cone using acid download --cone.
2. Register them with acid.connect("./data/") and inspect the schemas with s.list_catalogs().
3. Run a nearest-neighbor crossmatch at 1″, look at the distance distribution, and plot a (J vs G) color-magnitude diagram with matplotlib.
4. Swap in mode => 'all' and LEFT JOIN to see what changes.
5. Save the result with r.write_parquet(...) and acid.run(..., output=...).

See the Quickstart for the commands that get you to step 1 today.