ИСТИНА

Since July 2014, the Gaia mission of the European Space Agency (ESA) has been observing objects in the Solar System among its various scientific objectives. The third data release (DR3) includes observations of over 150,000 objects, including asteroids. The analysis of reflectance spectra of asteroids by Gaia has enabled, for the first time, the determination of spectral classes for many objects and the confirmation or refinement of previously determined classes. The distribution of spectral groups aligns with ground-based observations (Binzel et al. (2019)) with a sample overlap of less than 20%. The main groups include the S-group (∼60%) and the C-group (∼20-25%). Among the Mars-crossers, there is a slightly higher number of objects with mixed mineralogy. This distribution remains consistent across different object diameter ranges. The analysis of the distribution of spectral groups by semi-major axis and perihelion distance can serve as indirect evidence of the prevalence of sublimationdust activity in primitive-type asteroids