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Discoverer 21
Reconnaissance satellite. Discoverer 21 was launched on February 18, 1961 aboard a Thor Agena B from Vandenberg. Latest status in GCAT: reentered attached to another object (Apr 20, 1962).
COSPAR 1961 ZETNORAD 84United States
Identity
- Name in GCAT
- Discoverer 21
- Payload designation
- CORONA RM-2
- Other names
- :C,:CC,DRM-2,RM-2 (Midas),CORONA 21:CA
- International designator
- 1961 ZET
- NORAD catalog number
- 84
- GCAT identifier
- S00084
- UN registration
- A/AC.105/INF.001
Mission
- Mission type
- Optical imaging
- Use
- Defense
- Program
- CORONA Early
- Owner
- USAF BMD
- Country
- United States
- Builder
- Lockheed Missiles and Space Division
- Platform (bus)
- CORONA
Launch
- Date
- February 18, 1961 · 22:57 UTC
- Launch record
- 1961 ZETSuccess
- Rocket
- Thor Agena B
- Spaceport
- Vandenberg · pad 75-3-5
Orbit and fate
- Orbit class (GCAT)
- LEO/I
- Perigee
- 243 km
- Apogee
- 1,026 km
- Inclination
- 80.74°
- Status
- Reentered attached to another object
- Status date
- April 20, 1962
- Last known active
- Feb 20, 1961
- End of operations
- Feb 20, 1961
Size
- Mass
- 146 kg
- Dry mass
- 146 kg
- Total mass with attached objects
- 936 kg
- Length
- 2.0 m
- Diameter
- 1.50 m
- Span
- 2.0 m
Source: GCAT payload, deep-space and lander catalogs, Jonathan C. McDowell (CC BY 4.0); Wikidata Q5281804 (CC0).