From the Tunguska Space Body to the Evolution of the Protoplanetary Nebula

O. G. Gladysheva

Protecting the Earth against Collisions with Asteroids and Comet Nuclei, In: A. M. Finkelstein, W. F. Huebner, V. A. Shor (Eds) Proceedings of the International Conference “Asteroid-Comet Hazard-2009”, StP: Nauka, 157–163 (2010)

Ключевые слова: Very Long Baseline Interferometry (VLBI), Near Earth Objects (NEOs), Tunguska cosmic body (TCB), carbonaceous substances, TCB explosion epicenter, comet nucleus structure, protoplanetary nebula, organic molecules and gases, NH, CO, HS, radiation, cosmic rays, thermal processing, polymerization of the initial components, carbon-chain molecules

Аннотация

A model for the structure of comet nuclei is proposed based on the results of the investigations of carbonaceous substances from the epicenter of the Tunguska cosmic body (TCB) explosion. According to this model the comet nucleus structure is a conglomerate of micron sized ice granules covered with organic materials that have dust particles as their nuclei. Such structure could be formed at a stage of continuous temperature decrease in the protoplanetary nebula. After the water vapour has condensed onto the dust particles, organic molecules and gases such as NH, CO, HS, etc. are precipitated on the surfaces of ice-covered grains. Under the influence of different types of radiation (for example, cosmic rays) and thermal processing the polymerization of the initial components takes place and as a result carbon-chain and more complex molecules are formed