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Minotaur-C (Taurus)
Taurus rocket.jpg
Taurus 3210 preparing to launch ROCSAT 2 on May 20, 2004.
Function Orbital launch vehicle
Manufacturer Orbital Sciences, Orbital ATK
Country of origin United States
Height 27.9 m (91.5 ft)
Diameter 2.35 m (7.7 ft)
Mass 73,000 kg (160,000 lb)
Stages 4
Payload to LEO 1,320 kg (2,910 lb)
Launch history
Status Active
Launch sites Wallops Flight Facility
LC-576E, Vandenberg AFB
Cape Canaveral
Kodiak Launch Complex
Total launches 9
Successes 6
Failures 3
First flight 13 April 1994, 22:32 UTC
USA 101/USA 102
First stage - Castor 120
Engines 1 solid
Thrust 1,606.6 kN (361,177 lbf)
Specific impulse 286 sec
Burn time 83 seconds
Fuel Solid
Second stage - Taurus-1
Engines 1 solid
Thrust 484.9 kN (109,012 lbf)
Specific impulse 285 sec
Burn time 73 seconds
Fuel solid
Third stage - Pegasus-2
Engines 1 solid
Thrust 118.2 kN (26,570 lbf)
Specific impulse 292 sec
Burn time 73 seconds
Fuel solid
Fourth stage - Pegasus-3
Engines 1 solid
Thrust 34.57 kN (7,770 lbf)
Specific impulse 293 sec
Burn time 65 seconds
Fuel solid

Minotaur-C (Minotaur Commercial), formerly known as Taurus,[1] is a four stage, solid fuel launch vehicle built in the United States by Orbital Sciences Corporation (now Orbital ATK). It is based on the air-launched Pegasus rocket from the same manufacturer. The Minotaur-C is able to carry a payload of around 1,350 kg into a low Earth orbit. First launched in 1994, it has successfully completed six out of a total of nine military and commercial missions.[2] Three of four launches between 2001 and 2011 ended in failure, including the February 24, 2009 launch of the Orbiting Carbon Observatory mission[3] and the March 4, 2011 launch of the Glory mission.[4] The failure of the two latest launches resulted in losses totalling $700 million for NASA (not including cost of the rockets themselves).[5][6] The rocket was subsequently rebranded as the Minotaur-C, which incorporates new avionics based on those used by the Minotaur series of rockets.[1][2]


The Minotaur-C's first stage, an Orbital ATK Castor 120, is based on a Peacekeeper ICBM first stage. Stages 2 and 3 are Orion-50s (like the Pegasus-1 but without wings or stabilisers), and stage 4 is an Orion-38, derived from the Pegasus-3.[7]

Numbering system

Different configurations are designated using a four digit code, similar to the numbering system used on Delta rockets. The first digit denotes the type of first stage being used, and whether the second and third stages use a standard or "XL" configuration.[8][9] The second digit denotes the diameter of the payload fairing.[8] The third digit denotes the type of fourth stage.[8] The fourth digit denotes an optional fifth stage, so far unused.[8]

Number First digit Second Digit Third Digit Fourth Digit
First stage Second stage Third stage Fairing diameter Fourth stage Fifth stage
0 N/A N/A N/A None
1 TU-903 Orion 50ST Orion 50T 1.60 m (63 in) Orion 38 N/A
2 Castor-120 Orion 50ST Orion 50T 2.34 m (92 in) N/A N/A
3 Castor-120 Orion 50SXLT Orion 50XLT N/A Star-37FM Star-37[9]

List of launches

Flight number Date/Time(UTC) Vehicle type Payload Result
1 March 13, 1994
ARPA Taurus STEP Mission 0 & DARPASAT Success
2 February 10, 1998
Commercial Taurus, 92" payload fairing and 63" dual payload attach fitting GFO and ORBCOMM (Satellites 11,12) Success
3 October 3, 1998
Air Force Taurus Configuration, 63" fairing, Peacekeeper Stage 0 Space Technology Experiment (STEX) for National Reconnaissance Office (NRO) Success
4 December 21, 1999
Model 2110, 63" fairing, Castor 120 Stage 0 KOMPSAT and ACRIMSAT Success
5 March 12, 2000
Air Force Taurus Configuration, 63" fairing, Peacekeeper Stage 0 Multispectral Thermal Imager (MTI) Success
6 September 21, 2001
Model 2110, 63" fairing Castor 120 Stage 0 Orbview-4/QuikTOMS Failure
7 May 20, 2004
Model 3210, 92" fairing, Castor 120 Stage 0 ROCSAT-2 Success
8 February 24, 2009
Model 3110, 63" fairing Castor 120 Stage 0 Orbiting Carbon Observatory [10] Failure
9 March 4, 2011
Model 3110, 63" fairing Castor 120 Stage 0 Glory, KySat-1, Hermes, and Explorer-1 [PRIME] Failure[11]

Launch failures


On September 21, 2001, a Taurus XL rocket failed during launch. When the second stage ignited at T+83 seconds, a nozzle gimbal actuator drive shaft seized for approximately 5 seconds causing loss of control. The vehicle recovered and continued to fly the mission profile, but failed to reach a stable orbit and reentered near Madagascar.[12]

Orbiting Carbon Observatory

On February 24, 2009, a Taurus XL rocket failed during the launch of the $270m Orbiting Carbon Observatory spacecraft.[13] Liftoff occurred successfully at 09:55 GMT from Vandenberg Air Force Base, but data received at a later stage of the flight suggested that the fairing failed to separate. The rocket did not reach orbit,[3] owing to the extra weight of the fairing.[5][11] Launch vehicle and services for OCO are estimated at $54m.[14] The replacement satellite, Orbiting Carbon Observatory-2, was launched July 2, 2014.[15][16][17]


On March 4, 2011, a Taurus XL rocket failed again during the launch of NASA's $424 million Glory climate change monitoring satellite. In total, the last two failures of the Taurus XL have resulted in payload losses worth $700 million.[6] The reason for the failure was the same as with OCO: the payload fairing failed to separate, although the rocket's manufacturer Orbital Sciences Corporation had spent the last two years trying to fix the problem and had made several design changes to the fairing separation system. Ronald Grabe, manager of Orbital Sciences Corporation, which also built the Glory satellite itself, said the employees of his companies are "pretty devastated" because of the latest failure.[5] The fairing was built by the Vermont Composites company, and the frangible rail pyrotechnic separation system was built by the Ensign-Bickford Company. A NASA MIB panel concluded that the failure was most likely caused by a section of the frangible rail somewhere near the nose cap failing to separate. While a root cause could not be identified, two likely causes were identified: the rubber charge holder in the frangible rail slumping due to launch acceleration and random vibration, or a failure of the frangible rail system due to it operating outside the environment for which it was tested.[18]

Ground-Based Interceptor

The upper stages of the Minotaur-C are used by the boost vehicle of the Ground-Based Interceptor,[19] the anti-ballistic missile component of the U.S. Missile Defense Agency's Ground-Based Midcourse Defense system.

See also


  1. 1.0 1.1 Clark, Stephen (24 February 2014). "Taurus rocket on the market with new name, upgrades". Spaceflight Now. Retrieved 26 May 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. 2.0 2.1 Krebs, Gunter. "Taurus / Minotaur-C". Retrieved 26 May 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. 3.0 3.1 "Satellite to pinpoint sources and sinks of CO2".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. "Glory". NASA.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  5. 5.0 5.1 5.2 "NASA launch mishap: Satellite crashes into ocean". CBS. 2011-03-04.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. 6.0 6.1 "NASA science satellite lost in Taurus launch failure". Spaceflight Now. 2011-03-04.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  7. "Taurus". Encyclopedia Astronautica.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  8. 8.0 8.1 8.2 8.3 Krebs, Gunter. "Taurus-3110". Gunter's Space Page. Retrieved 2009-03-08.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  9. 9.0 9.1 "Fact Sheet" (PDF). Taurus. Orbital Sciences Corporation. Retrieved 2009-03-08.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  10. "OCO". Orbital Sciences Corporation.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  11. 11.0 11.1 "Taurus rocket nose shroud dooms another NASA satellite". Spaceflight Now, March 2011.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  12. International reference guide to space launch systems, Fourth Edition, p. 486, ISBN 1-56347-591-X
  13. Failure hits Nasa's 'CO2 hunter'
  14. NASA FY2009 Budget Estimates
  15. "Homepage: Orbiting Carbon Observatory-2 (OCO-2)". NASA. Jet Propulsion Laboratory. 2013. Retrieved 2014-04-05.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  16. "NASA's OCO-2 brings sharp focus on global carbon". Phys Org. 3 April 2014. Retrieved 2014-04-05.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  17. [1]
  18. NASA. "Overview of the Glory Mishap Investigation Results for Public Release" (PDF). NASA. Retrieved 2013-02-20.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  19. William Graham (27 June 2013). "Orbital's Pegasus XL successfully lofts IRIS spacecraft". NASASpaceFlight.com. The Orbital Boost Vehicle, developed for the US military’s Ground Based Interceptor program, uses the upper stages of the Taurus<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  20. "Antares". Gunter's Space Page.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>

External links