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For the first time, spectral signs of subtle coma activity were observedsimultaneously on four main-belt primitive asteroids (145) Adeona, (704)Interamnia, (779) Nina, and (1474) Beira around their perihelion distances inSeptember 2012, which were interpreted as manifestations of the sublimation ofH2O ice in/under the surface matter (Busarev et al., 2015a, 2015b). We confirmthe phenomenon for Nina when it approached perihelion in September 2016. At thesame time, based on results of spectral observations of near-Earth asteroid(162173) Ryugu (Vilas, 2008) being a target of Japan's Hayabusa 2 spacemission, we suspected a periodic similar transient activity on the Cg-typeasteroid. However, unlike the main-belt primitive asteroids demonstratingsublimation of ices close to their perihelion distances, the effect on Ryuguwas apparently registered near aphelion. To explain the difference, wecalculated the subsolar temperature depending on heliocentric distance of theasteroids, considered qualitative models of internal structure of main-belt andnear-Earth primitive asteroids including ice and performed some analyticalestimations. Presumed temporal sublimation/degassing activity of Ryugu pointsto the existence of a residual frozen core in its interior. It could be anindication of a relatively recent transition of the asteroid from the mainasteroid belt to the near-Earth area.

New candidates for active asteroids: main-belt (145) Adeona, (704) Interamnia, (779) Nina, (1474) Beira, and near-Earth (162173) Ryugu