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Landsat 5
Artist's rendering of Landsat 5.
Launch date March 1, 1984
Carrier rocket Delta 3920
Launch site Vandenberg AFB SLC-2W
Orbital elements
Reference system WRS-2
Regime sun-synchronous, near-polar
Inclination 98.2°
Altitude 705 km (438 mi)
Repeat interval 16 days
Swath width 185 km (115 mi)
Equatorial crossing time 9:45 AM +/- 15 minutes

Landsat 5 is the fifth satellite of the Landsat program. It was launched on March 1, 1984, with the primary goal of providing a global archive of satellite photos. The Landsat Program is managed by USGS, and data from Landsat 5 is collected and distributed from the USGS's Center for Earth Resources Observation and Science. On March 2nd 2009, Landsat 5 celebrated its 25th anniversary of operation, 22 years over its 3-year mission.[1]

Solar Array Drive Anomaly

On November 26, 2005, the back-up solar array drive on Landsat 5 began exhibiting unusual behavior. The solar array drive maintains the proper pointing angle between the solar array and the sun. The rotation of the solar array drive became sporadic, and the solar array was not able to provide the power needed to charge the batteries. Maintaining power to the batteries is critical to sustain proper operation of the spacecraft. The primary solar array drive failed under similar circumstances in January 2005. As a result of this situation, imaging operations were suspended.[2] After a month-long investigation in December 2005 and testing in January 2006, new operating procedures were developed that will allow Landsat 5 to continue normal operations.[3]

Still sending data

In March 2009, Landsat 5 celebrated its 25 years in orbit and was still sending back data.[1]

Malfunction on August 13, 2009

On August 13, 2009, Landsat 5 tumbled out of control and power fell to a critical level due to an unknown event.[4] Landsat 5 resumed nominal operation (battery savings mode) on August 17, 2009.[5]

Malfunction on December 18, 2009

On December 18, 2009, the transmitter on Landsat 5 experienced technical difficulties.[6]

Data downlink was restored on January 7, 2010 after a test successfully managed to retrieve a picture over North America. This test exercised the only remaining Traveling Wave Tube Amplifier (TWTA). The remaining TWTA is in fact the primary TWTA that was in operation when Landsat 5 launched in 1984. After several issues in late 1986 and 1987, the primary TWTA was turned off and the secondary, or redundant, TWTA had been used since. The USGS Flight Operations Team were able to apply lessons learned while operating the redundant TWTA to the primary TWTA for its first successful transmission in over 22 years.[7]

Specifications

Landsat 5 has significantly exceeded its designed life expectancy by over 22 years by 2009, and lasting 25 years total. It has a maximum transmission bandwidth of 85 Mbit/s. It was deployed at an altitude of 705.3 km (438.3 mi). It takes some 16 days to scan the entire Earth. The satellite is an identical copy of Landsat 4 and was originally intended as a backup: it therefore carries the same instruments, including the Thematic Mapper and Multi-Spectral Scanner. The Multi-Spectral Scanner was powered down in 1995.[8]

See also

References

  1. ^ a b Hansen, Kathryn (March 2, 2009). "Earth-Observing Landsat 5 Turns 25". NASA. http://www.nasa.gov/topics/earth/features/landsat_bday.html. 
  2. ^ "Landsat 5 Solar Array Drive Anomaly". USGS. Archived from the original on 2007-12-13. http://web.archive.org/web/20071213041533/http://landsat.usgs.gov/technical_details/investigations/l5_solar_drive.php. Retrieved 2008-09-12. 
  3. ^ Stephen Clark (28 January 2006). "Landsat 5 Satellite Recovers From Latest Glitch". SPACE.com. http://www.space.com/missionlaunches/sfn_060128_landsat_5.html. Retrieved 2008-09-12. 
  4. ^ USGS (August 24, 2009). "Landsat 5 Experiences Malfunction". Press release. http://www.usgs.gov/newsroom/article.asp?ID=2281. 
  5. ^ "Landsat 5 TM Resumes Nominal Operations". USGS. August 17, 2009. http://landsat.gsfc.nasa.gov/news/news-archive/news_0228.html. 
  6. ^ "Technical Announcement: Landsat 5 Anomaly". USGS. January 7, 2010. http://www.usgs.gov/newsroom/article.asp?ID=2376. 
  7. ^ "Landsat 5 Transmits Data". USGS. January 7, 2010. http://landsat.usgs.gov/mission_headlines2010.php. 
  8. ^ "History of Landsat 5". NASA. http://landsat.gsfc.nasa.gov/about/landsat5.html.

Source: http://en.wikipedia.org/wiki/