Tuesday, December 5th, 2023

Russia’s Luna-25 mission probably crashed due to velocity measurement

Moscow. Russian space corporation Roscosmos said on Tuesday that it is feared that the biggest reason for the crash of the country’s Luna-25 moon lander mission was the incorrect operation of the angular velocity measurement unit. Roscosmos said in a statement that the most likely cause of the Luna-25 accident was the abnormal functioning of the on-board control complex, associated with the failure to turn on the accelerometer unit in the BIUS-L device (angular velocity measurement unit) due to possible entry. Was. Commands with different priorities will be placed in a data array for their execution by the device.

According to the statement, the distribution of commands in such a data set is random or in other words probabilistic. Because of this, the on-board control complex received zero signals from the accelerometer of the BIUS-L device, the statement said. This did not allow to identify the moment of reaching the required speed and turn off the spacecraft in time, while issuing the corrective impulse. propulsion system, resulting in its shutdown according to a temporary setting. The space corporation also said that the interdepartmental commission is completing its work on identifying the causes of the accident and has prepared recommendations to prevent similar issues in the future. Notably, Luna-25, the first Russian lunar mission in nearly 50 years and the first in history during the Soviet Union—before Russia’s gun—launched from Russia’s Vostochny Cosmodrome on August 11 aboard a Soyuz-2.1B carrier rocket and a Entered lunar orbit weeks later. Last August 20, Roscosmos said Luna-25 apparently crashed on the lunar surface after going into an unplanned orbit.

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