An artist’s impression of the Chandra X-ray Observatory. The telescope is in safe mode due to an as-yet-unexplained technical problem. Image: NASA
NASA’s Chandra X-ray Observatory entered protective “safe mode” on 10 October due to a malfunction of some soft. The Hubble Space Telescope went into safe mode 5 October due to problems with one of its four operational gyroscopes.
It is not yet known what sidelined Chandra.
“At approximately 1355 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,” NASA said in a statement posted on the observatory’s web page.
“Analysis of available data indicates the transition to safe mode was nominal, i.e., consistent with normal behaviour 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.”
Launched aboard the shuttle Columbia in July 1999, the Chandra X-Ray Observatory has operated 14 years past its five-year design life. It is one of NASA’s original “Great Observatories” projects along with Hubble, the Compton Gamma-Ray Observatory and the Spitzer Space Telescope.