Hayabusa spacecraft disintegrates upon re-entry (NASA) |
On Dec. 16, 2011, Roskosmos reported parameters of Phobos-Grunt's orbit as 275.7 by 201.3-kilometers and predicted its reentry between the 6th and 19th of January 2012. According to the agency, more accurate prediction of the reentry time and its location could be made no earlier than few days in advance. Around 20-30 fragments with a total mass of no more than 200 kilograms were to reach the Earth surface, the agency said.
Roskosmos confirmed that 10 micrograms of the radioactive Cobalt-57 isotope were a part of one of the scientific instruments onboard the spacecraft, however a tiny amount of material and its slow decay rate would render it harmless to the environment. All propellant onboard the spacecraft would burn up at an altitude of around 100 kilometers, Roskosmos said.
Above: The final architecture of the Phobos-Grunt spacecraft. Credit: NPO Lavochkin |
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