Landsat 4
Artist's rendering of Landsat 5, which is identical to Landsat 4. | |||||||
| Mission type | Earth observations | ||||||
|---|---|---|---|---|---|---|---|
| Operator | NASA / NOAA | ||||||
| COSPAR ID | 1982-072A | ||||||
| SATCAT no. | 13367 | ||||||
| Mission duration | 3 years (planned) 18 years, 10 months, 30 days (final) | ||||||
| Spacecraft properties | |||||||
| Bus | Multimission Modular Spacecraft | ||||||
| Manufacturer | GE Astro Space | ||||||
| Launch mass | 1,941 kg (4,279 lb) | ||||||
| Dry mass | 1,407 kg (3,102 lb) | ||||||
| Power | 1,430 W | ||||||
| Start of mission | |||||||
| Launch date | 16 July 1982, 17:59 UTC | ||||||
| Rocket | Delta 3920 | ||||||
| Launch site | Vandenberg AFB SLC-2W | ||||||
| End of mission | |||||||
| Disposal | Decommissioned | ||||||
| Declared | 14 December 1993 | ||||||
| Deactivated | 15 June 2001 | ||||||
| Decay date | 8 October 2025 | ||||||
| Orbital parameters | |||||||
| Reference system | Geocentric | ||||||
| Regime | Sun-synchronous | ||||||
| Perigee altitude | 700 km (430 mi) | ||||||
| Apogee altitude | 704 km (437 mi) | ||||||
| Inclination | 98.2° | ||||||
| Period | 98.81 minutes | ||||||
| Repeat interval | 16 days | ||||||
| Epoch | August 17, 1982 | ||||||
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Landsat 4 is the fourth satellite of the Landsat program. It was launched on 16 July 1982, with the primary goal of providing a global archive of satellite imagery. Although the Landsat program is managed by NASA, data from Landsat 4 was collected and distributed by the U.S. Geological Survey. Landsat 4 science operations ended on 14 December 1993, when the satellite lost its ability to transmit science data, far beyond its designed life expectancy of five years. The satellite housekeeping telemetry and tracking continued to be maintained by NASA until it was decommissioned on 15 June 2001.