Predição de Microlentes Gravitacionais

Abstract

The aim of this study was to develop a methodology for predicting apparent close encounters between two stars, using a robust stellar motion propagation approach for gravitational microlensing events. This methodology incorporated parallaxes and radial velocities to improve the accuracy of the predictions. The work was based on the results obtained by Kluter et al. (2022), who identified 4842 of these encounters. A Python code was used, taking advantage of the astropy and astroquery libraries, along with data from the Gaia-DR3 catalog. After analysis, we found 74,590 predictions from 1974 to 2116, of which 3609 coincided with those of the authors. Notably, between 2010 and 2070, the period examined by Kluter et al. (2022), we identified 32,114 close encounters, six times more than the number previously recorded. In addition, from the current period (2024) to 100 years (2116) the time of the catalog (J2016.0), 45,831 events were found.