JASY is a scientific Python/PyQt6 software package for asteroid astrometry, photometry, and light-curve analysis. It was developed to support the reduction and analysis of CCD observations of Solar System small bodies, with emphasis on asteroids. The software integrates FITS handling, astrometric calibration, small-body field identification, multiband photometry, relative photometry, ALCDEF export, and Fourier Series-based rotational light-curve analysis. JASY is intended for observational workflows involving asteroid detection, target anchoring, comparison-star selection, photometric extraction, and generation of scientific products for subsequent physical characterization. This release, v1.0.1, is a patch release following the initial archival version v1.0.0. It includes corrections and improvements related to FITS header compatibility and small-body identifier handling. Main changes in v1.0.1: - Added more robust FITS header parsing for observatory-specific files.- Added support for numeric FITS header values stored as strings.- Added support for additional FITS header aliases, including keys such as `EXPOSURE`, `HBIN`, `VBIN`, `PLATESCL`, and related variants.- Improved small-body identifier handling for JPL Horizons queries.- Numbered objects are now preferentially queried by MPC number.- Unnumbered objects are now preferentially queried by provisional designation.- Common names are preserved as metadata/fallbacks, but are not used as the primary JPL Horizons identifier when a number or provisional designation is available. This release supersedes v1.0.0 as the recommended stable version of JASY. The previous archived version is available at DOI: 10.5281/zenodo.20148618.