ИСТИНА

Our spectrophotometric studies of primitive type asteroids of the Main Belt show that a significant part of them (up to ~30-40%) have spectral signs of a rarefied dust exosphere due to sublimation of their constituent ices (e.g., Busarev et al., 2022). But since the extent of sublimation-dust exospheres on such asteroids in most cases does not exceed their radius, the resolving power of ground-based optical telescopes (no more than 0.01 angul. sec.) is not enough to confirm this on direct images. The possibility of increasing the angular resolution by several orders of magnitudes when observing any space objects in the millimeter range in the case of implementation of the Millimetron project gives hope that the above-mentioned problem in asteroid research will also be solved.