Satellites, space stations, and deep space probes.
| Label | Operator | Status | Orbit | Launch Date | |
|---|---|---|---|---|---|
| Explorer I | U.S. Army | retired | LEO | 2/1/1958 | 0 |
| Vanguard (1957-F01) | U.S. Naval Research Lab | retired | - | 12/6/1957 | 0 |
| 2-y ISZ | - | retired | LEO | 11/3/1957 | 0 |
| 1-y ISZ | - | retired | - | 10/4/1957 | 0 |