A Gaia DR3 Core-Membership Catalog for 359 Open Clusters from M-CTNC

This record is the final open-data release for the accepted ApJS manuscript AAS76533, “A Gaia DR3 Core-Membership Catalog for 359 Open Clusters from M-CTNC.” The archive contains the final machine-readable release tables, validation products, raw Gaia DR3 cone-field tables for the 359 benchmark open clusters, Figure 1--6 source data, final publication figures, and reproduction code. It also includes the core M-CTNC extraction code, baseline-comparison scripts, ablation and sensitivity scripts, figure-generation scripts, and data-audit materials used to support the accepted manuscript. The principal source catalog is the CORE_BENCHMARK astrometric-core membership table, containing 15,875 Gaia DR3 source entries for 359 open clusters. The auxiliary HALO_EXPLORATION layer contains 18,485 source entries and is provided only for boundary-sensitivity analysis, not as a replacement catalog or a halo-completeness product. Release Table 2 is the primary conservative astrometric-core catalog. Release Tables 1, A, B, and C provide the cluster-level summary, benchmark metrics, anomaly-audit products, and dual-mode source-level provenance. Gaia photometry and spectroscopy are retained for posterior validation and downstream reuse, but they are not used in the M-CTNC membership assignment rule. The archived figure-source data and reproduction scripts allow readers to regenerate the final figures at arbitrary resolution.