Astronomers release catalog of rotation periods for more than one million stars

Astronomers have published a new catalog listing rotation periods for over one million stars. The dataset was compiled using photometric observations from space‑based surveys. It expands previous catalogs by an order of magnitude in sample size. The rotation periods help scientists study stellar magnetic activity and age. The researchers applied automated algorithms to detect periodic brightness variations. The catalog is made publicly available for further astrophysical analysis. It is expected to aid investigations of stellar evolution across the Milky Way. Future work will compare these periods with spectroscopic measurements for validation.