The engineers switched the telescope to backup power — this allowed to return full control over it.
NASA specialists have successfully launched the telescope’s backup computer and are now checking the stability of the equipment. Next, the engineers will recalibrate the scientific instruments of the telescope, after which Hubble can be returned to normal research work. NASA announced this on its official website.
The last failure was the largest in the history of Hubble and could well have been fatal, bringing the telescope into complete inoperable — it would have turned into uncontrolled space debris. To return the Hubble to service, NASA engineers had to perform a complex step-by-step procedure for switching to a backup computer, which lasted for several days.
First, the engineers activated the backup power management unit to “wake up” the remaining backup units. At the second stage, they turned on the backup control and formatting blocks of scientific data, after which the final step remained — the transfer of all blocks to alternative connections. As a result, the telescope switched to a fully functional backup circuit, which includes all functions — power, control and data collection.
Hubble failed on June 13 due to the degradation of the memory chips of the main control computer. All attempts to restart the computer without using the full backup scheme over and over again ended in failure. The telescope has been operating in orbit for 31 years, its equipment was released in the 80-90s, while it is now impossible to repair it directly in space, as it used to be, because of the closure of the Shuttle program.