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Chandra Goes In And Out Of Safe Mode

By Keith Cowing
October 15, 2018
Filed under
Chandra Goes In And Out Of Safe Mode

NASA Chandra X-ray Observatory Update: Out Of Safe Mode
“The cause of Chandra’s safe mode on October 10 has now been understood and the Operations team has successfully returned the spacecraft to its normal pointing mode. The safe mode was caused by a glitch in one of Chandra’s gyroscopes resulting in a 3-second period of bad data that in turn led the on-board computer to calculate an incorrect value for the spacecraft momentum. The erroneous momentum indication then triggered the safe mode.”
Chandra X-ray Observatory Enters Safe Mode; Investigation Underway
“At approximately 13:55 GMT on October 10, 2018, NASA’s Chandra X-ray Observatory entered safe mode, where the telescope’s instruments are put into a safe configuration, critical hardware is swapped to back-up units, the spacecraft points so that the solar panels get maximum sunlight, and the mirrors point away from the Sun. Analysis of available data indicates the transition to safe mode was nominal, i.e., consistent with normal behavior for such an event. All systems functioned as expected and the scientific instruments are safe. The cause of the safe mode transition is currently under investigation, and we will post more information when it becomes available.”

NASA Watch founder, Explorers Club Fellow, ex-NASA, Away Teams, Journalist, Space & Astrobiology, Lapsed climber.