Minotaur I

The Minotaur I, or just Minotaur is an American expendable launch system derived from the Minuteman II missile. It is used to launch small satellites for the US Government, and is a member of the Minotaur family of rockets produced by Orbital Sciences Corporation.

Minotaur I
Minotaur I with NFIRE at MARS
FunctionSmall expendable launch system
ManufacturerNorthrop Grumman
Country of originUnited States
Size
Height19.21 metres (63.0 ft)
Diameter1.67 metres (5 ft 6 in)
Mass36,200 kilograms (79,800 lb)
Stages4 or 5
Capacity
Payload to LEO
Mass580 kilograms (1,280 lb)
Payload to SSO
Mass331 kilograms (730 lb)
Launch history
StatusActive
Launch sitesVandenberg SLC-8
MARS LP-0B
Total launches11
Success(es)11
First flight27 January 2000
Last flight20 November 2013
First stage – M55A1
Engines1 Solid
Thrust935 kilonewtons (210,000 lbf)
FuelSolid
Second stage – SR19
Engines1 Solid
Thrust268 kilonewtons (60,000 lbf)
FuelSolid
Third stage – Orion 50XL
Engines1 Solid
Thrust118.2 kilonewtons (26,600 lbf)
Burn time74 seconds
FuelSolid
Fourth stage – Orion 38
Engines1 Solid
Thrust34.8 kilonewtons (7,800 lbf)
Burn time68 seconds
FuelSolid

Vehicle

The Minotaur I is the follow-on to the Orbital Sciences' Taurus (later re-named the "Minotaur-C"[1]) launch vehicle, combining the original Taurus's booster stage with a second stage from a Minuteman missile.

Minotaur I rockets consist of the M55A1 first stage and SR19 second stage of a decommissioned Minuteman missile.[2] The Orion 50XL and Orion 38, from the Pegasus rocket, are used as third and fourth stages. A HAPS (Hydrazine Auxiliary Propulsion System) upper stage can also be flown if greater precision is needed, or the rocket needs to be able to manoeuvre to deploy multiple payloads.[3] It can place up to 580 kilograms (1,280 lb) of payload into a 185-kilometer (115 mi) low Earth orbit at 28.5 degrees of inclination.[2]

Initially Minotaur I launches are conducted from Space Launch Complex 8 at the Vandenberg Air Force Base. Starting with the launch of TacSat-2 in December 2006, launches have also been conducted from Pad 0B at the Mid-Atlantic Regional Spaceport on Wallops Island.[3]

Launch history

There have been eleven launches of the Minotaur I, all successful.

Flight Date (UTC)RocketPayloadLaunch padTrajectoryResult
1 January 27, 2000
03:03:06		Minotaur IJAWSat (P98-1) (FalconSat1 / ASUSat1 / OCSE / OPAL)Vandenberg SLC-8LEOSuccess[4]
2 July 19, 2000
20:09:00		Minotaur IMightySat II.1 (Sindri, P99-1) / MEMS 2A / MEMS 2BVandenberg SLC-8LEOSuccess[5]
3 April 11, 2005
13:35:00		Minotaur IXSS-11Vandenberg SLC-8LEOSuccess[6]
4 September 23, 2005
02:24:00		Minotaur IStreak (STP-R1)Vandenberg SLC-8LEOSuccess[7]
5 April 15, 2006
01:40:00		Minotaur ICOSMIC (FORMOSAT-3)Vandenberg SLC-8LEOSuccess[8]
6 December 16, 2006
12:00		Minotaur ITacSat-2 / GeneSat-1MARS LP-0BLEOSuccess[9]
7 April 24, 2007
06:48		Minotaur INFIREMARS LP-0BLEOSuccess[10]
8 May 19, 2009
23:55		Minotaur ITacSat-3MARS LP-0BLEOSuccess[11]
9 February 6, 2011
12:26		Minotaur IUSA-225 (NROL-66)Vandenberg SLC-8LEOSuccess[12]
10 June 30, 2011
03:09		Minotaur IORS-1MARS LP-0BLEOSuccess[13]
11 November 20, 2013
01:15		Minotaur IORS-3,[14] STPSat-3 and 28 CubeSat satellites[15]MARS LP-0BLEOSuccess[16]
12 Q2 2021[17]Minotaur INROL-111[18]MARS LP-0BLEO(?)Planned

See also

References
  1. Clark, Stephen (24 February 2014). "Taurus rocket on the market with new name, upgrades". Spaceflight Now. Retrieved 26 May 2014.
  2. "Minotaur I Space Launch Vehicle—Fact Sheet" (PDF). Orbital Sciences Corporation. 2012. Retrieved 2012-02-28. Spacecraft mass-to-orbit of up to 580 kg to LEO (28.5 deg, 185 km)
  3. "Minotaur I User's Guide - Release 3.0" (PDF). Orbital Sciences Corporation. Retrieved 1 September 2015.
  4. Ray, Justin. "Spaceflight Now - Minotaur Mission Report - Mission Status Center - JAWSAT". Retrieved 21 April 2013.
  5. Ray, Justin. "Spaceflight Now - Minotaur Mission Report - Mission Status Center - Mightysat 2.1". Retrieved 21 April 2013.
  6. Ray, Justin. "Minotaur rocket launches U.S. military spacecraft". Spaceflight Now. Retrieved 21 April 2013.
  7. Ray, Justin. "Rocket launch paints sky with breath-taking scene". Spaceflight Now. Retrieved 21 April 2013.
  8. Ray, Justin. "Spaceflight Now - Minotaur Mission Report - Mission Status Center - COSMIC". Spaceflight Now. Retrieved 21 April 2013.
  9. Clark, Stephen. "Minotaur rocket makes sunrise ascent from Virginia". Spaceflight Now. Retrieved 21 April 2013.
  10. Ray, Justin. "Missile research spacecraft soars into orbit from Virginia". Spaceflight Now. Retrieved 21 April 2013.
  11. Clark, Stephen. "Minotaur lofts experimental satellite for U.S. military". Spaceflight Now. Retrieved 21 April 2013.
  12. "Orbital Successfully Launches Minotaur I Rocket for U.S. Air Force". Orbital Sciences Corporation. Retrieved 21 April 2013.
  13. "Orbital Successfully Launches Minotaur I Rocket Carrying ORS-1 Satellite for the U.S. Air Force". Orbital Sciences Corporation. Retrieved 21 April 2013.
  14. "Media Accreditation Open for ORS-3 Mission from Wallops in November". Retrieved 30 October 2013.
  15. "Orbital's Minotaur I successfully lofts multitude of payloads". NASASpaceFlight.com. Retrieved 20 November 2013.
  16. "Orbital Successfully Launches Minotaur I Rocket Supporting ORS-3 Mission for the U.S. Air Force". Wall Street Journal. Retrieved 20 November 2013.
  17. "NROL-129 Launch Press Kit" (PDF). Retrieved 9 July 2020.
  18. "Minotaur rocket launch for NRO expected at Wallops by end of 2018". Retrieved 20 September 2018.


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