Unha 2 – Space Launch Report

Unha 2 - Space Launch Report

North Korea first launched its “Unha-2” rocket from Musudan-ri in the northeast of the country on April 5, 2009.  The launch occurred at 02:30 UTC.    No confirmation of the planned Kwangmyongsong-2 satellite orbital insertion was subsequently reported.  North American Aerospace Defense Command and U.S. Northern Command did not track any objects entering orbit, but called the “Taepo Dong 2 missile” a “space launch vehicle”.

Unha 2 - Space Launch Report

Unha-2 is believed to be a three-stage rocket derived from North Korea’s Taepo Dong 2 ballistic missile – a missile that first flew, unsuccessfully, in 2006.  Japanese authorities reported that the rocket’s first stage fell into the Sea of Japan and that the second stage had flown over Japan on a due-east trajectory.   Prior to the launch, North Korea announced that the first stage would fall 500-750 km downrange and that the second stage would fall 3,150-3,950 km downrange.   

South Korean officials said that the second stage had landed short of its planned drop zone, implying a possible second stage failure.  Other reports suggested that the second stage did reach full range, implying a separation or third stage failure. 

Taepo Dong 2 first flew on July 5, 2006.  The rocket, believed to have been attempting a suborbital test, failed after only 40 seconds.   Taepo Dong 2’s big new first stage is thought to be powered by four engines, one of which powered the country’s earlier Taepo Dong 1 first stage.  The four engines may produce 112 tonnes of liftoff thrust, sufficient to rapidly lift the 78 tonne launch vehicle.

North Korea’s first orbital space launch attempt occurred on August 31, 1998.  That failed launch was performed by a  Taepo Dong 1 rocket.  Taepo Dong 1 used a solid motor third stage, a Scud-missile-based second stage, and a “Rodong-1” based first stage.   Rodong-1 was a North Korean-developed stage thought to be a scale-up of the old Soviet Scud missile.  Taepo Dong 1 stood 22.5 meters tall, was 1.8 meters in diameter, and weighed about 21 tonnes. 

Also read: Tsyklon – Space Launch Report

Vehicle Configurations (Estimates Only)

 LEO
Payload
(metric tons)
250 km x 90 deg
 ConfigurationLIftoff
Height
(meters)
Liftoff
Mass
(metric tons)
Unha 20.1 t? 2 Stg Taepo Dong 2 with solid Stg 327 m78 t

Vehicle Components (Estimates Only)

Stage 1Stage 2Stage 3
Diameter (m)2.25 m1.3 m1 m
Length (m)14 m8 m5 m (incl PLF)
Propellant Mass (tons)60 t9 t0.8 t
Total Mass (tons)66 t11 t1.0 t
Engine4xRodong-11xRodong-1
Engine Mfgr
FuelUDMH*UDMH*Solid
OxidizerNitric Acid/N2O4Nitric Acid/N2O4Solid
Thrust
(SL tons)
112 t
Thrust
(Vac tons)
21 t5.4 t
ISP (SL sec)s
ISP (Vac sec)sss
Burn Time (sec)110 s110 s40 s
No. Engines411
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