UNITED STATES AIR FORCE

Thor DM-21 Ablestar | Transit 2A

SUCCESS Thor DM-21 Ablestar →
Jun 22, 1960 at 05:54 UTC
Polar Orbit Navigation Cape Canaveral SFS, FL, USA 68% success
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Live Orbit
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Mission Control3D trajectory · Live telemetry · AI narrator · Booster tracking
PADSpace Launch Complex 17B
SITECape Canaveral SFS, FL, USA →
ORBITPolar Orbit
TYPENavigation

The Transit system was the first satellite navigation system to be used operationally. The system was primarily used by the U.S. Navy to provide accurate location information to its Polaris ballistic missile submarines, and it was also used as a navigation system by the Navy’s surface ships, as well as for hydrographic survey and geodetic surveying.

MISSION
Transit 2A
MISSION TYPE
Navigation
TARGET ORBIT
Polar Orbit
COUNTRY
USA
CONFIRMEDPrecision: Minute
LAUNCH LIBRARY 2 PRIMARY
API ID: bc9375ae-6a9e-4eba-8358-cbf5b008def9
Reported date: Jun 22, 1960 at 05:54 UTC
Last synced: 2 minutes ago
This launch date and time are confirmed by the launch provider. Countdown is active.
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MANUFACTURER
United States Air Force
VARIANT
DM-21
FLIGHTS
19
SUCCESSES
13
SUCCESS RATE
68.4%

The Thor-Ablestar, or Thor Able-Star, also known as Thor-Epsilon was an early American expendable launch system consisting of a PGM-17 Thor missile, with an Ablestar upper stage. It was a member of the Thor family of rockets, and was derived from the Thor-Able.

When is the Thor DM-21 Ablestar | Transit 2A launch?
The Thor DM-21 Ablestar | Transit 2A is scheduled for Wednesday, June 22, 1960 at 5:54 AM UTC. This is the NET (No Earlier Than) time and may be subject to change. Current status: SUCCESS.
What rocket is being used for Transit 2A?
The Thor DM-21 Ablestar | Transit 2A mission uses the Thor DM-21 Ablestar rocket, manufactured by United States Air Force. The Thor DM-21 Ablestar has flown 19 times with a 68.4% success rate.
Where is the Thor DM-21 Ablestar | Transit 2A launching from?
The launch takes place from Space Launch Complex 17B at Cape Canaveral SFS, FL, USA.
What orbit is Transit 2A going to?
The Transit 2A mission is targeting Polar Orbit.
Who is launching Transit 2A?
The Thor DM-21 Ablestar | Transit 2A is operated by United States Air Force.
Can I watch the Thor DM-21 Ablestar | Transit 2A 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.
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: Jun 22, 1960 at 05:54 UTC
NET (No Earlier Than) confirmed by United States Air Force
Mar 28, 2026 20:12 UTC
Launch completed successfully
Updated via Launch Library 2
Last data sync: 2 minutes ago
Launch Library 22 minutes ago
Launch ID: bc9375ae-6a9e-4eba-8358-cbf5b008def9
Open-Meteo Weather5 days ago
Pad weather at 28.45, -80.57

Mission Profile

Transit 2A was a Thor DM-21 Ablestar mission operated by United States Air Force that lifted off from Space Launch Complex 17B, Cape Canaveral SFS, FL, USA on June 22, 1960. The flight carried its payload on a navigation mission to Polar Orbit. The launch was a success.