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Because of relatively high surface temperatures and quick evolution oforbital parameters of near-Earth asteroids (NEAs) of primitive types, thepossibility of retention of icy materials (predominately H2O ice) remains inquestion. Yet, based on summarized results of spectroscopic observations ofApollonian (162173) Ryugu (Cg-type) being a target of Japanese Hayabusa 2 spacemission, we suspected a transient sublimation activity on the asteroid.However, unlike some main-belt primitive asteroids demonstrating sublimation ofices close to their perihelion distances and, respectively, at the highestsubsolar temperatures, the effect on Ryugu was apparently observed nearaphelion. To explain the difference, we calculated the subsolar temperaturedepending on Ryugu heliocentric distance and performed some analyticalestimations related to internal structure and thermo-physical parameters ofthis and similar NEAs. Presumed temporal sublimation and dust activity of Ryuguis an indication of existence of a residual frozen core in its interior whichcould point to a relatively recent transition of the asteroid from the mainasteroid belt to the near-Earth region.

Possible sublimation and dust activity on primitive NEAs: Example of (162173) Ryugu