Аннотация:On the basis of low-resolution spectrophotometric and multiband (UBVRI) observations of asteroids and numerical simulations of their reflectance spectra, we analyze the events of simultaneous sublimation activity observed on 145 Adeona, 704 Interamnia, 779 Nina and Mars-crosser 1474 Beira in September 2012 and on 24 Themis, 449 Hamburga, and 704 Interamnia in March 2019 near their perihelia. Activity of Themis and Hamburga was detected for the first time.