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Improved TIROS Operational System
5 satellites and probes
| Spacecraft | Launch | Operator | Launch vehicle |
|---|---|---|---|
| ITOS-J | December 1, 1979 | — | Delta |
| ITOS-I | July 1, 1977 | — | Delta |
| ITOS-E2 | September 23, 1976 | — | Delta |
| ITOS-E | July 16, 1973 | — | Delta 0100 |
| ITOS-B | October 21, 1971 | — | Thor-Delta |