Featured Research

from universities, journals, and other organizations

Hubble Telescope Placed Into Safe Hold As Gyroscope Fails

Date:
November 16, 1999
Source:
National Aeronautics And Space Administration
Summary:
NASA's Hubble Space Telescope was placed into a safe hold at approximately 8:30 a.m. EST Saturday morning when gyroscope #1 ceased operation. With only two operational gyros remaining, the science program will be suspended until completion of Servicing Mission 3A, currently scheduled for launch aboard Space Shuttle Discovery on Dec. 6, 1999.

NASA's Hubble Space Telescope was placed into a safe hold at approximately 8:30 a.m. EST Saturday morning when gyroscope #1 ceased operation. With only two operational gyros remaining, the science program will be suspended until completion of Servicing Mission 3A, currently scheduled for launch aboard Space Shuttle Discovery on Dec. 6, 1999.

Related Articles


This gyro situation is not expected to impact the upcoming servicing mission. In fact, anticipation that another gyro could fail was the primary reason that Hubble managers scheduled an early repair mission and split the third servicing mission activities into two flights: Servicing Mission-3A (Dec. 6, 1999) and Servicing Mission-3B (Mid-2001).

"This event underscores the wisdom of dividing the third HST Servicing Mission into two parts, with Servicing Mission 3A scheduled for December 1999 -- only 3 weeks of science data will be lost," said Dr. John Campbell, Hubble Space Telescope Program Manager at NASA's Goddard Space Flight Center, Greenbelt, MD.

The safe-hold mode has been thoroughly tested and used twice since Hubble's launch in 1990. The telescope is not at risk. This protective safe mode allows ground control of the telescope, but with only two gyros working, Hubble cannot be aimed with the precision necessary for scientific observations of the sky.

The safe mode does not require gyros, so even if another gyro should fail in the next few weeks, HST will remain safe, according to project managers. The aperture door has been closed to protect the optics, and the spacecraft is aligned to the sun to ensure adequate power is received by Hubble's solar panels.

Engineers are investigating the cause of the gyro loss. The gyro will be returned to ground after the upcoming servicing mission for in-depth analysis.

During Servicing Mission 3A, astronauts will replace all the gyroscopes, a fine guidance sensor, a transmitter, a spare solid-state recorder and a high-voltage/temperature kit for protecting batteries from overheating. Additionally, the crew will install an advanced computer.

Servicing Mission 3B will be conducted in 2001 to complete the third HST servicing mission activities.

Additional information on the mission and Hubble is available at:

http://hubble.gsfc.nasa.gov/


Story Source:

The above story is based on materials provided by National Aeronautics And Space Administration. Note: Materials may be edited for content and length.


Cite This Page:

National Aeronautics And Space Administration. "Hubble Telescope Placed Into Safe Hold As Gyroscope Fails." ScienceDaily. ScienceDaily, 16 November 1999. <www.sciencedaily.com/releases/1999/11/991116060954.htm>.
National Aeronautics And Space Administration. (1999, November 16). Hubble Telescope Placed Into Safe Hold As Gyroscope Fails. ScienceDaily. Retrieved December 22, 2014 from www.sciencedaily.com/releases/1999/11/991116060954.htm
National Aeronautics And Space Administration. "Hubble Telescope Placed Into Safe Hold As Gyroscope Fails." ScienceDaily. www.sciencedaily.com/releases/1999/11/991116060954.htm (accessed December 22, 2014).

Share This


More From ScienceDaily



More Space & Time News

Monday, December 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

NASA Prepares for Next Phase of Hubble Successor

NASA Prepares for Next Phase of Hubble Successor

Reuters - Innovations Video Online (Dec. 22, 2014) Scientists and engineers prepare for the next phase of the James Webb Space Telescope, the scientific successor to the Hubble. Nathan Frandino reports. Video provided by Reuters
Powered by NewsLook.com
Spokesman: 'NORAD Ready to Track Santa'

Spokesman: 'NORAD Ready to Track Santa'

AP (Dec. 19, 2014) Pentagon spokesman Rear Adm. John Kirby said that NORAD is ready to track Santa Claus as he delivers gifts next week. Speaking tongue-in-cheek, he said if Santa drops anything off his sleigh, "we've got destroyers out there to pick them up." (Dec. 19) Video provided by AP
Powered by NewsLook.com
NASA's Planet-Finding Kepler Mission Isn't Over After All

NASA's Planet-Finding Kepler Mission Isn't Over After All

Newsy (Dec. 18, 2014) More than a year after NASA declared the Kepler spacecraft broken beyond repair, scientists have figured out how to continue getting useful data. Video provided by Newsy
Powered by NewsLook.com
Rover Finds More Clues About Possible Life On Mars

Rover Finds More Clues About Possible Life On Mars

Newsy (Dec. 17, 2014) NASA's Curiosity rover detected methane on Mars and organic compounds on the surface, but it doesn't quite prove there was life ... yet. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins