UNITED STATES AIR FORCE
Thor DM-21 Agena-B | Discoverer 28
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Aug 4, 1961 at 00:01 UTC
▸ Flight profile›
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PADSpace Launch Complex 1W
SITEVandenberg SFB, CA, USA →LAUNCH DETAILS
VEHICLE
Thor DM-21 Agena-BAGENCY
United States Air ForceLAUNCH PAD
Space Launch Complex 1WLAUNCH SITE
Vandenberg SFB, CA, USACOUNTRY
USA
LAUNCH TIME VERIFICATION
CONFIRMEDPrecision: Minute
LAUNCH LIBRARY 2 PRIMARY
API ID: b7e331d8-dece-4041-8261-979f542f38de
Reported date: Aug 4, 1961 at 00:01 UTC
Last synced: 4 minutes ago
This launch date and time are confirmed by the launch provider. Countdown is active.
LAUNCH MAP
PAD WEATHER
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VEHICLE — Thor DM-21 Agena-B →
MANUFACTURER
United States Air Force
FLIGHTS
40
SUCCESSES
32
SUCCESS RATE
80%
Thor-Agena was a series of orbital launch vehicles.
FREQUENTLY ASKED QUESTIONS
When is the Thor DM-21 Agena-B | Discoverer 28 launch?
The Thor DM-21 Agena-B | Discoverer 28 is scheduled for Friday, August 4, 1961 at 12:01 AM UTC. This is the NET (No Earlier Than) time and may be subject to change. Current status: FAILURE.
What rocket is being used for Thor DM-21 Agena-B | Discoverer 28?
The Thor DM-21 Agena-B | Discoverer 28 mission uses the Thor DM-21 Agena-B rocket, manufactured by United States Air Force. The Thor DM-21 Agena-B has flown 40 times with a 80% success rate.
Where is the Thor DM-21 Agena-B | Discoverer 28 launching from?
The launch takes place from Space Launch Complex 1W at Vandenberg SFB, CA, USA.
Who is launching Thor DM-21 Agena-B | Discoverer 28?
The Thor DM-21 Agena-B | Discoverer 28 is operated by United States Air Force.
Can I watch the Thor DM-21 Agena-B | Discoverer 28 launch live?
Yes. Visit the launch detail page on Space Launch Live for embedded YouTube webcasts, replay videos, and links to live coverage from SpaceX, NASA, NASASpaceflight, and other channels.
LAUNCH TIMELINE
Mar 28, 2026 20:12 UTC
Launch added to tracker
Imported from Launch Library 2 API
Mar 28, 2026 20:12 UTC
Launch date set: Aug 4, 1961 at 00:01 UTC
NET (No Earlier Than) confirmed by United States Air Force
Mar 28, 2026 20:12 UTC
Launch failure reported
Updated via Launch Library 2
LIVE DATA SOURCES
Last data sync: 4 minutes ago
●Launch Library 24 minutes ago
Launch ID: b7e331d8-dece-4041-8261-979f542f38de
●Open-Meteo Weather3 days ago
Pad weather at 34.76, -120.63
Mission Profile
Thor DM-21 Agena-B | Discoverer 28 was a Thor DM-21 Agena-B mission operated by United States Air Force that lifted off from Space Launch Complex 1W, Vandenberg SFB, CA, USA on August 4, 1961. The launch ended in failure.