Explorer 21 (IMP-B)
Explorer 21 (IMP-B) on AeroVia
Follow this mission
Alerts are unavailable because this mission is no longer active.
Identity
- Aliases
- Explorer XXIExplorer 21Interplanetary Monitoring Platform 2Interplanetary Monitoring Platform IIIMP-BIMP-21964-060
- Name
- Explorer 21 (IMP-B)
- Status
- completed
Details
- Astronauts
- -
- Destination
- Highly elliptical geocentric Earth orbit at approximately 193 km perigee and 95,400 km apogee (about 35-hour period; 33.5° inclination)
- End Date
- 1966-01-30
- Programs
- Start Date
- 1964-10-04
- Vehicle Families
Links
Assets & Meta
- Creation Time
- August 14, 2026 at 19:58:56 UTC
- Updated Time
- August 21, 2026 at 11:01:06 UTC
Other
- Affiliations
- Space Stations
- -
- Vehicles