ИСТИНА

Based on the data of reflectance spectroscopy using 2-m telescope of Terskol Observatory operated by Institute of Astronomy of Russian Academy of Science, we have discovered simultaneous sublimation activity on four main-belt primitive asteroids 145 Adeone, 704 Interamnia, 779 Nina, and 1474 Beira being simultaneously near their perihelion distances in September 2012 (Busarev et al., 2015). As follows from the Mie theory and numeric modeling (Hansen, Travis, 1974) the main spectral feature pointing to a regular subtle coma of frozen H2O micron-sized particles around of an asteroid is a strong maximum in the near-UV or visible spectral range.