ИСТИНА

Recent careful examination of (4) Vesta with the Dawn spacecraft (NASA) showed presence of numerous spots of primitive dark carbonaceous and/or hydrated materials on the basaltic surface of the asteroid (e. g., [1, 2]). The data completely confirmed previous ground-based spectrophotometric detections of such unusual low-temperature compounds on the surface of Vesta [3-5]. There is no doubt that the low-temperature features on Vesta's surface are traces of impact events over entire history of the asteroid. We have found spectral signs of similar features on surfaces of many other igneous asteroids [5, 6]. A total number of such data points to existence of a flux of primitive bodies directed inside the Solar system. The intensity of the flux was apparently maximal during some time after origin of our planetary system and connected possibly with formation of C- and BGF-type asteroids. We suggested that hydrated silicate-organic matter could origin and accumulate in the cores of water-differentiated bodies existed for the first few millions of years in the growth zone of Jupiter [7]. Gravitational scattering of such bodies by proto-Jupiter to the main asteroid belt [8] might have led to fragmentation and re-accretion of their primitive materials (including carbonaceous chondrites and water-ice) on the surfaces of many asteroid parent bodies and/or asteroids themselves. References: [1] De Sanctis M. C. et al. 2012, Aph. J. Lett., 758, L36, 5pp. [2] Reddy V. et al. 2012, Icarus, 221, 544. [3] Hasegawa S. et al. 2003, Geoph. Res. Let., 30, 2123. [4] Busarev V.V. et al. 2007, Physics – Uspekhi, 50, 637. [5] Busarev V.V. 2010, Solar Sys. Res., 44, 507. [6] Busarev V.V. 2002, Solar Sys. Res., 36, 39. [7] Busarev V. V. 2012, ACM 2012, #6017. [8] Safronov V. S., Ziglina I. N., 1991, Solar Sys. Res., 25, 139.