The Minotaur IV is an all-solid-fuel expendable launch vehicle derived from the decommissioned LGM-118 Peacekeeper intercontinental ballistic missile (ICBM). Currently owned and operated by Northrop Grumman, the Minotaur IV provides reliable and cost-effective access to space for U.S. government payloads.

Specs

Height: 23.88 m (78.3 ft)

Diameter: 2.34 m (7 ft 8 in)

Mass: 86,300 kg (190,300 lb)

Stages: 4

Payload to Low Earth Orbit (LEO): 1,730 kg

The rocket made its inaugural flight in April 2010 and launches from several sites across the United States, including California, Alaska, Florida, and Virginia.

The Minotaur IV features a four-stage configuration. The first three stages are consistent across all variants, being sourced directly from the Peacekeeper missile. The fourth stage, however, is interchangeable depending on mission requirements, and can be equipped with either the Orion 38 or the more powerful Star 48V motor.

Caption courtesy of Northrop Grumman.

Space Launch Complex 8 (SLC-8) is a launch facility at Vandenberg Space Force Base in California, used primarily for launching small orbital rockets into polar and sun-synchronous orbits. Operated by Northrop Grumman, SLC-8 supports the Minotaur family of rockets, especially the Minotaur I and Minotaur IV, which are frequently used for U.S. government and defense-related payloads. The site includes a mobile service tower, flame trench, integration buildings, and support infrastructure optimized for quick-turnaround missions.

Originally built as part of a ballistic missile test complex, the pad was modernized in the late 1990s and reconfigured for orbital launches. Its first orbital launch took place in January 2000, when a Minotaur I successfully lifted off carrying multiple small satellites. Since then, SLC-8 has hosted over a dozen launches, supporting missions for organizations like the U.S. Air Force, NASA, and the National Reconnaissance Office (NRO).

Notable missions include the TacSat-2 mission in 2006, which demonstrated rapid-response satellite deployment, and several classified payloads for national security. The site remains a vital asset in the U.S. launch infrastructure, particularly for responsive space access, where speed and flexibility are key.