Seestar Instrumentation: Code and Data

Code, calibration products and reference tables behind "Characterizing the ZWO Seestar S30 Pro as a Multi-Modal Astronomical Instrument" (Dai and Dai), prepared for Publications of the Astronomical Society of the Pacific. Photometry, astrometry, spectroscopy and polarimetry of a ZWO Seestar S30 Pro from Vancouver, British Columbia, measured on frames recorded in 2026 July, August and September. Version 2 adds the reduction code, every calibration product and figure the campaign wrote, the instrument constants file the paper's tables are built from, and the Gaia DR3 field tables the calibration reads. The raw frames and per-frame star catalogs are too large for one record and are not included in this version. See README.md for the file layout. Code is MIT licensed; data are CC BY 4.0.