Two astronomers from the Universidad Complutense de Madrid in Spain made the latest mini-moon discovery while calculating the dynamics of near-Earth objects. Their findings were published in the journal Research Notes of the AAS.
https://iopscience.iop.org/article/10.3847/2515-5172/ad781f
Prior research through NASA's Asteroid Terrestrial-impact Last Alert System had already shown that the space rock was not a threat to smashing into Earth.
https://www.nasa.gov/solar-system/nasa-asteroid-tracking-system-now-capable-of-full-sky-search/
Compared to mini-moons of the recent past, 2024 PT5 is a short-timer. In July 2006, a visitor dubbed RH120 stayed in orbit around Earth for a year before getting flung out in July 2007.
https://minorplanetcenter.net//mpec/K08/K08D12.html