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Landsat
A continuing series of NASA Earth resources satellites, data from which are made freely available for public use. The Landsat program was originally known as the Earth Resources Technology (ERT) program, and Landsat 1 as ERTS-1; the name was changed by NASA in 1975. All the Landsats have been launched from Vandenberg Air Force Base.
| spacecraft | launch date | launch vehicle | orbit | mass (kg) |
| Landsat 1 | Jul. 23, 1972 | Delta 100 | 895 × 908 km × 99° | 816 |
| Landsat 2 | Jan. 22, 1975 | Delta 2914 | 898 × 912 km × 99° | 953 |
| Landsat 3 | Mar. 5, 1978 | Delta 2914 | 895 × 915 km × 99° | 960 |
| Landsat 4 | Jul. 16, 1982 | Delta 3925 | 693 × 705 km × 98° | 1,942 |
| Landsat 5 | Mar. 1, 1984 | Delta 3925 | 695 × 703 km × 98° | 1,938 |
| Landsat 6 | Oct. 5, 1993 | Titan II | failed to reach orbit | 1,740 |
| Landsat 7 | Apr. 15, 1999 | Delta 7925 | 668 × 698 km × 98° | 1,969 |
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