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astronautix.com Landsat 4-5

Landsat 4
Landsat 4 -

Credit: NASA. 13,697 bytes. 263 x 323 pixels.



Class: Earth. Type: Landsat. Nation: United States. Agency: NASA, GSFC, NOAA, EOSAT. Manufacturer: GE Astro Space, Fairchild.

The Landsat 4 and 5 spacecraft were placed into lower orbits than the previous Landsat spacecraft and carried improved instrument suites. Beginning in 1983, Landsat 4 began experiencing numerous spacecraft malfunctions which limited spacecraft functionality. This prompted the early launch of Landsat 5 to guarantee continued coverage. Management of the spacecraft was transferred from NASA to NOAA with Landsat 4. Spacecraft: Structure of aluminum with graphite struts. Hydrazine propulsion system. Single solar array with 1-axis articulation produces 1430 W (BOL), Two NiCd batteries provide 100 AHr total. Retractable boom (4 m long) with 2 powered joints supports the articulated HGA which downlinks data via TDRSS. Communications system uses S, X, L, and Ku-Bands.3-axis stabilised, zero momentum with control to 0.01 deg using reaction wheels. Shortly after launch, Landsat 4 lost use of half its solar power. Landsat 5 lost two of its primary communications systems (X-Band downlink and a Ku-Band TDRSS transponder) and backup systems were activated. Payload: Carried Multi-Spectral Scanner (MSS) and Thematic Mapper (TM) imaging sensors. TM provides 7 bands of coverage and the MSS has 4 bands. The MSS covers 0.5 to 12.6 m and provides 80 m resolution with a 185 km swath width. TM covers 0.45 to 12.5 m with resolution of 30 meters in the VIS/IR bands and 120 m in the thermal/IR bands.


Specification

Design Life: 5 years . Total Length: 4.3 m. Maximum Diameter: 2.2 m. Total Mass: 1,940 kg.


Landsat 4-5 Chronology


16 July 1982 Landsat 4 Program: Landsat. Launch Site: Vandenberg . Launch Vehicle: Delta 3925. Mass: 1,942 kg. Perigee: 693 km. Apogee: 705 km. Inclination: 98.2 deg.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).


01 March 1984 Landsat 5 Program: Landsat. Launch Site: Vandenberg . Launch Vehicle: Delta 3925. Mass: 1,938 kg. Perigee: 695 km. Apogee: 703 km. Inclination: 98.2 deg.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).



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Last update 12 March 2001.
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