RocketThor Delta C
SpaceportCape Canaveral & Kennedypad LC17A
OutcomeSuccess
Launch agencyGSFCUnited States
Flight
- Date and time (UTC)
- October 4, 1964, 03:45
- Launch designation
- 1964-060
- Mission
- IMP B
- Flight name
- Explorer 21
- Vehicle flight ID
- 392/D026
- Year
- Launches in 1964
Orbit and payload
- Initial apogee
- 95,569 km
- Payload mass to orbit
- 0.062 t
- Payloads
- 1
- GCAT launch code
- OS
Payloads
| Payload | Designation | Owner | Mission type | Mass | Fate |
|---|---|---|---|---|---|
| IMP 2 | 1964-060ANORAD 889 | NASA Goddard Space Flight Center | Space science | 62 kg | Reentered (orbital decay) · January 1966 |
Source: GCAT launch list and payload catalogs, Jonathan C. McDowell (CC BY 4.0). Orbit values are the initial orbit reported for the launch.