As a result of the explosion of the tank of the Fregat-SB upper stage, it formed 325 debris at altitudes from 100 to 6000 kilometers.

The explosion of the tank of the Russian upper stage Fregat-SB in May 2020 was the most serious incident in space in five years, as reported by NASA.

“Based on the new data, this destruction was the most serious such event in the last five years,” the report said.

As of February 1, U.S. surveillance has found 325 pieces of debris from the blast at altitudes of 100 to 6,000 kilometers, of which 309 remained in space.

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The exploded object was in orbit with a minimum altitude of 427 kilometers and a maximum of 3,629 kilometers and was a toroidal dumped block of tanks of the Fregat-SB upper stage, which, when the satellite was launched into space, separated after the fuel was used.

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The destroyed block of Fregata-SB tanks was used in July 2011 to deliver the Spektr-R observatory into space. On May 10, 2020, the United States announced that the tank exploded in orbit on May 8 with the formation of 65 debris. Later, Roskosmos confirmed the destruction, noting that the debris did not threaten the International Space Station and Russian satellites.