STP-S26

Minotaur IV

Launch of the first Minotaur IV Lite
Function	Expendable launch system
Manufacturer	Orbital Sciences
Cost per launch	$50 million
Size
Height	23.88 meters (78.3 ft)
Diameter	2.34 meters (7 ft 8 in)
Mass	86,300 kg
Stages	4
Capacity
Payload to LEO	1735 kg (28.5 deg, 185 km)
Associated rockets
Family	Minotaur
Derivatives	Minotaur V
Launch history
Status	Active
Launch sites	SLC-8, Vandenberg AFB LP-0B, MARS LP-1, Kodiak SLC-46, Cape Canaveral
Total launches	6
Successes	6
First flight	22 April 2010
First stage – SR-118
Engines	1 Solid
Thrust	2,200 kN (490,000 lbf)
Fuel	Solid
Second stage – SR-119
Engines	1 Solid
Thrust	1,365 kN (307,000 lbf)
Burn time	54 seconds
Fuel	Solid
Third stage – SR-120
Engines	1 Solid
Thrust	329 kN (74,000 lbf)
Burn time	62 seconds
Fuel	Solid
Fourth stage (Baseline) – Orion 38
Engines	1 Solid
Thrust	32.2 kN (7,200 lbf)
Burn time	67.7 seconds
Fuel	Solid
Fourth stage (Optional) – Star-48V
Engines	1 Solid
Thrust	68.6 kN (15,400 lbf)
Burn time	84.1 seconds
Fuel	Solid

Minotaur IV, also known as Peacekeeper SLV and OSP-2 PK is an active expendable launch system derived from the LGM-118 Peacekeeper ICBM. It is operated by Orbital Sciences Corporation, and made its maiden flight on 22 April 2010, carrying the HTV-2a Hypersonic Test Vehicle. The first orbital launch occurred on 26 September 2010 with the SBSS satellite for the United States Air Force.

The Minotaur IV vehicle consists of four stages and is capable of placing 1,735 kilograms (3,825 lb) of payload into a Low Earth orbit (LEO). It uses the first three stages of the Peacekeeper missile, combined with a new upper stage. On the baseline version, the fourth stage is an Orion 38. However a higher performance variant, designated Minotaur IV+, uses a Star-48V instead. A three-stage configuration (no Orion-38), designated the Minotaur IV Lite, is available for Suborbital trajectories. The Minotaur IV has also been flown with multiple upper stages. A five-stage derivative, the Minotaur V, made its maiden flight on 7 Sep 2013.

Minotaur IV launches will be conducted from SLC-8 at Vandenberg Air Force Base, LP-0B at the Mid-Atlantic Regional Spaceport, SLC-46 at Cape Canaveral Air Force Station and Kodiak Launch Complex Pad 1 of the Kodiak Launch Complex.