Yes, Gaia is accurate enough to predict microlensing events: 

• Gaia Data Release 3 (DR3) Predicted 4,500 microlensing events, 1,664 of which are unlike any previously seen 
• Gaia DR2 Predicted 3,914 microlensing events caused by 2,875 different lenses between 2010 and 2065 
• Gaia eDR3 Predicted 4,842 astrometric-microlensing events caused by 3,791 distinct HPMSs 

Microlensing is a phenomenon that occurs when light from background sources is deflected and amplified by foreground objects. Astrometric microlensing is a tool to measure stellar masses. 

The Gaia mission can measure the effect of astrometric microlensing with an accuracy of order 10 to 100 μas

Using information from Gaia’s third data release (DR3), the team predicted 4500 microlensing events, 1664 of which are unlike any we have seen. These events will allow astronomers to conduct lucrative research into distant star systems, exoplanets, and other celestial objects

A microlensing event is a special case of gravitational lensing. In microlensing, a massive object (the lens) bends the light of a bright background object (the source). This can generate multiple distorted, magnified, and brightened images of the background source. 

The lens isn’t made from glass or plastic but it is provided by the gravitational field of the closer star. As the closer star moves in front of the distant star the magnified image of the distant star gets brighter, reaches a peak and then gets dimmer in a smooth way. 

Einstein predicted gravitational microlensing in 1936 using his General Theory of Relativity. 

The Nancy Grace Roman Space Telescope, a space-based telescope currently in development by NASA, is expected to observe vastly more microlensing events than its ground-based counterparts such as OGLE. 

The Gaia mission is a European Space Agency (ESA) astronomical observatory mission that aims to create a three-dimensional map of the Milky Way.  The mission’s goal is to survey about 1% of the galaxy’s 100 billion stars.  Gaia will provide positional measurements for about one billion stars in the Milky Way, and radial velocity measurements for the brightest 150 million objects.  The mission will also map the motions, luminosity, temperature, and composition of these stars. 

Gaia’s instruments include two identical telescopes and an imaging system. The mission monitors each of its target stars about 14 times per year. Gaia’s nominal mission ended after 5.5 years (2019), but the mission is currently in its extended mission until December 31, 2025. 

The first data release, Gaia DR1, was on September 14, 2016. Gaia is measuring the positions of objects 4000 times fainter than the naked eye limit to an accuracy of 24 microarcseconds. This is comparable to measuring the diameter of a human hair at a distance of 1000 km.

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