| Name of the satellite | IMP-A |
|---|---|
| Other name(s) | Explorer 18 IMP 1 00693 |
| COSPAR designation | 63-046A |
| Project(s) Manager(s) of the satellite | Paul Butler (retired) |
| Institute of the project(s) manager(s) | NASA-GSFC |
| Country or Space Agency | USA |
| Link(s) to Web site(s) | http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1963-046A |
| Launch date (dd-mm-yyyy) | 27-11-1963 |
| Termination date (dd-mm-yyyy) | 30-12-1965 |
| Lifetime of the satellite (month) | 25 |
| Type of the orbits | HEO |
| (Initial) Perigee (km) | 192 |
| (Initial) Apogee (km / Re) | 197616 / 31 |
| Orbital period (min / hour) | 5666 / 94.4 |
| Spin rate (rpm) | 22.2 |
| Eccentricity | 0.937 |
| Inclination (°) | 33.3 |
| Observed regions | Magnetosphere |
| Observed waves | ***** |
| Name of the experiment | Fluxgate Magnetometer |