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fredag 1 maj 2015
Progress M-27M news.
The Block I stage of the Soyuz has already re-entered. For Progress M-27M, an untargeted, uncontrolled re-entry seems inevitable.The Russian Space Agency issued their initial re-entry estimate showing a period of May 5-7. Using orbital propagation tools that take into account atmospheric conditions, re-entry predictions of May 10 +/-3 Days can be obtained. As Progress slowly gets closer to the atmosphere, predictions will be refined so that on the day of re-entry, the position of orbital decay can be narrowed down to one orbit.
Re-entering the atmosphere, Progress will burn up and disintegrate to a large extent, but a number of pieces are known to survive re-entry and make it to the ground, including the Progress docking mechanism that is quite heavy, components of the main engine, and small spherical pressurant tanks. One large unknown is the propellant aboard the spacecraft that is stored in large tanks – if the toxic Unsymmetrical Dimethylhydrazine fuel and Nitrogen Tetroxide oxidizer freeze inside the tanks, some of the propellants may reach the ground.
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