Google Play icon

Hubble in Safe Mode as Gyro Issues are Diagnosed

Share
Posted October 9, 2018

NASA is working to resume science operations of the Hubble Space Telescope after the spacecraft entered safe mode on Friday, October 5, shortly after 6:00 p.m. EDT. Hubble’s instruments still are fully operational and are expected to produce excellent science for years to come.

NASA's Hubble Space Telescope. Credits: NASA

NASA’s Hubble Space Telescope. Credits: NASA

Hubble entered safe mode after one of the three gyroscopes (gyros) actively being used to point and steady the telescope failed. Safe mode puts the telescope into a stable configuration until ground control can correct the issue and return the mission to normal operation.

Built with multiple redundancies, Hubble had six new gyros installed during Servicing Mission-4 in 2009. Hubble usually uses three gyros at a time for maximum efficiency, but can continue to make scientific observations with just one.

The gyro that failed had been exhibiting end-of-life behavior for approximately a year, and its failure was not unexpected; two other gyros of the same type had already failed. The remaining three gyros available for use are technically enhanced and therefore expected to have significantly longer operational lives.

Two of those enhanced gyros are currently running. Upon powering on the third enhanced gyro that had been held in reserve, analysis of spacecraft telemetry indicated that it was not performing at the level required for operations. As a result, Hubble remains in safe mode. Staff at NASA’s Goddard Space Flight Center and the Space Telescope Science Institute are currently performing analyses and tests to determine what options are available  to recover the gyro to operational performance.

Science operations with Hubble have been suspended while NASA investigates the anomaly. An Anomaly Review Board, including experts from the Hubble team and industry familiar with the design and performance of this type of gyro, is being formed to investigate this issue and develop the recovery plan. If the outcome of this investigation results in recovery of the malfunctioning gyro, Hubble will resume science operations in its standard three-gyro configuration.

If the outcome indicates that the gyro is not usable, Hubble will resume science operations in an already defined “reduced-gyro” mode that uses only one gyro. While reduced-gyro mode offers less sky coverage at any particular time, there is relatively limited impact on the overall scientific capabilities.

Source: NASA

Featured news from related categories:

Technology Org App
Google Play icon
83,289 science & technology articles

Most Popular Articles

  1. Bright Fireball Explodes Over Ontario, Meteorite Fragments Might Have Reached the Ground (August 5, 2019)
  2. Why older people smell the way they do? Japanese have even a special word for it (August 4, 2019)
  3. Terraforming the Surface of Mars with Silica Aerogel? (July 23, 2019)
  4. Swarm Autonomy Tested in Second Major DARPA OFFSET Field Experiment (August 8, 2019)
  5. Dark Matter may Predate even the Big Bang Itself, New Study Suggest (August 8, 2019)

Follow us

Facebook   Twitter   Pinterest   Tumblr   RSS   Newsletter via Email