Northrop Grumman provides orbital launch services through the Pegasus and Minotaur families and is developing Antares 330 and Eclipse with Firefly Aerospace. Its launch portfolio includes an air-launched rocket, ground-launched vehicles assembled from solid-propellant stages, and larger rockets intended for station resupply and commercial payloads. Pegasus and Minotaur IV both conducted orbital missions in 2026, alongside continuing work on the partnered liquid-propellant vehicles.
The programs belong to a diversified aerospace and defense company headquartered in Falls Church, Virginia. Northrop Grumman’s 2018 acquisition of Orbital ATK brought the established launch businesses into the company. That history accounts for earlier mission records bearing the Orbital Sciences or Orbital ATK names, including Pegasus’s first flights and the introduction of Minotaur and Antares.
Launch Services Within a Larger Space Business
Northrop Grumman integrates vehicles, supplies launch services, and produces spacecraft and propulsion hardware. Its Space Systems business also works on government satellite programs and commercial resupply of the International Space Station. The company’s third-quarter 2026 results reported a two-percent increase in Space Systems sales, with growth in restricted programs partly offset by lower commercial resupply revenue associated with launch timing.
The relationship between a spacecraft contract and a rocket contract depends on the program. Cygnus is Northrop Grumman’s station cargo spacecraft, whereas Antares is a launch vehicle historically used to carry it. Pegasus and Minotaur carry spacecraft from other manufacturers. The company’s role within American commercial launch services includes both complete launch systems and spacecraft that can travel on another provider’s rocket.
Pegasus XL and Air Launch
Pegasus XL is a three-stage solid-propellant rocket carried beneath Northrop Grumman’s Stargazer, a modified Lockheed L-1011 aircraft. The published launch sequence begins with release at approximately 40,000 feet over the ocean. After about five seconds of free fall, the first-stage motor ignites. The winged rocket then climbs and accelerates independently, discarding stages as it delivers its payload to orbit.
Northrop Grumman lists a low Earth orbit capability of approximately 454 kilograms. The aircraft can carry the rocket to a selected release location and direction, giving the launch system geographic flexibility. The original Pegasus first flew on April 5, 1990, from a NASA B-52. Stargazer subsequently became the carrier aircraft for commercial operations, linking an aviation departure and ferry mission with a separate rocket ascent.
The Pegasus user guide identifies Orion 50S XL, Orion 50 XL, and Orion 38 motors as its three main propulsion stages. Solid propellant is stored within each motor before launch and burns after ignition. Pegasus’s first-stage wing and aerodynamic controls support the early flight through the atmosphere, followed by upper-stage propulsion for the remaining acceleration and orbital insertion.
Air launch changes the starting location and initial conditions of the rocket flight. The aircraft provides transport and the release altitude, and the rocket supplies the acceleration needed to attain orbital velocity. Mission planning consequently includes both aircraft operations and a trajectory from the release point. The satellite remains enclosed within its fairing during the carrier flight and the atmospheric portion of the rocket ascent.
The carrier aircraft also supports the spacecraft’s environment before release. Pegasus documentation describes conditioned, filtered air supplied to the payload fairing during ground operations and captive flight. Temperature, humidity, flow, and particulate levels are monitored. An optional hydrazine auxiliary propulsion system provides a liquid-propellant fourth stage for missions requiring improved insertion accuracy, adding a smaller propulsion element after the principal solid-motor ascent.
A 2026 mission illustrates that operating model. NASA’s Swift boost mission timeline records LINK spacecraft integration with Pegasus at Wallops in June, attachment of the rocket to Stargazer, and the aircraft’s departure for Kwajalein Atoll in the Marshall Islands. Pegasus launched LINK into orbit on July 3 after release from the aircraft. The mission used a launch location far from the initial payload processing facility.
LINK was built by Katalyst Space to approach NASA’s Neil Gehrels Swift Observatory and raise its orbit. NASA later reported an attitude-control problem aboard LINK that prevented the planned capture and boost operation. The launch had delivered the spacecraft to orbit; the subsequent spacecraft issue changed its servicing assignment. NASA said LINK would instead attempt rendezvous and proximity operations to demonstrate capabilities for future missions.
Minotaur I and Commercial Configurations
Minotaur I combines two government-supplied Minuteman stages with commercial upper-stage technology. Northrop Grumman’s Minotaur family overview lists four solid-propellant stages and a capability of up to 580 kilograms to low Earth orbit. The third and fourth stages share technology with Pegasus XL, along with associated structures and payload accommodation. The vehicle is ground-launched and supports government-sponsored payloads.
The company’s November 2025 user guide describes launch services supplied through the U.S. Space Force’s Rocket Systems Launch Program. It also documents a Minotaur I Commercial configuration, replacing the government-furnished lower stages with a Castor 120 and an Orion 50S XLT. Commercially produced boosters allow this configuration to serve payloads without government sponsorship.
That commercial option retains the upper stages, avionics, structures, and other systems of the basic Minotaur I arrangement. The guide gives a capability of 1,050 kilograms to a 740-kilometer circular sun-synchronous orbit from Vandenberg. It is a documented configuration with a specified destination and launch site, rather than a general payload figure that applies to every orbit or vehicle arrangement.
The broader commercial lineage also includes Minotaur-C, an upgraded version of the Taurus launcher. The FAA’s historical vehicle account describes a four-stage system using commercially manufactured solid motors and updated avionics. On October 31, 2017, it launched 10 Planet spacecraft from Vandenberg. Planet’s mission record confirms that flight, which carried six SkySats and four smaller Dove satellites.
Minotaur IV, V, and the Larger Offered Variants
Minotaur IV uses three government-furnished Peacekeeper motors followed by a commercial upper stage. Northrop Grumman lists a low Earth orbit capability of up to 1,730 kilograms. The larger motors distinguish it from Minotaur I, although the family shares avionics, integration experience, and other launch technology. The vehicle serves government missions that need more capacity than the smaller Minotaur I configuration.
Minotaur IV launched the STP-S29A mission from Vandenberg on April 7, 2026. NASA reported that the flight carried military, Space Force, academic, and NASA-associated payloads, including a CubeSat studying radio-wave propagation from Earth into space. The mission provided an orbital flight for multiple technology and research payloads within the government’s Space Test Program.
The Minotaur IV, V, and VI guide describes several upper-stage and lower-stage combinations. Minotaur IV+ substitutes a STAR 48BV motor for the standard Orion 38 fourth stage. Minotaur V adds a STAR 37 fifth stage to provide higher-energy trajectories, including transfers toward geosynchronous orbit or the Moon. These changes alter the final propulsion available after the main booster stages have burned out.
Minotaur V launched NASA’s Lunar Atmosphere and Dust Environment Explorer, or LADEE, on September 6, 2013, local time in Virginia. The launch from Wallops was the vehicle’s first and the facility’s first deep-space mission. LADEE subsequently studied the Moon’s thin atmosphere and dust environment before its planned impact on the lunar surface in April 2014.
For LADEE, the launch system’s assignment extended beyond placing a spacecraft into a low circular Earth orbit. Its upper stages supplied a departure trajectory toward the Moon, after which the spacecraft’s own systems supported the lunar mission. The additional stage in Minotaur V is associated with this higher-energy launch role. The mission connected an existing family of solid-propellant launch hardware with a scientific spacecraft designed to measure a different planetary environment.
Northrop Grumman also offers the Minotaur VI design, which adds another Peacekeeper first-stage motor beneath the Minotaur IV+ arrangement. Its product overview lists a capability of up to 3,100 kilograms to low Earth orbit. The guide describes a further VI+ configuration adding a STAR 37 final stage for higher-energy missions. These are offered vehicle configurations; the operational mission examples for the family include the flown Minotaur IV and V systems.
The family’s stage combinations serve different destinations using related hardware. A larger lower stack increases the mass accelerated early in flight, and an additional upper stage supplies velocity after earlier stages are discarded. The listed launch-site options include facilities on both U.S. coasts and in Alaska, with the usable trajectory and payload determined for each mission’s destination and vehicle configuration.
Antares 330 and Station Resupply
Antares 330 introduces a Firefly-built first stage to Northrop Grumman’s Antares system. According to the current Antares description, seven Miranda liquid-propellant engines replace the earlier first-stage arrangement, and the rocket retains the Castor 30XL solid upper stage. The preceding Antares 230+ flew its final mission in August 2023. The new configuration also retains Northrop Grumman’s MACH avionics and established mission-integration processes.
Northrop Grumman identifies up to three Antares 330 flights for commercial resupply missions to the International Space Station. The published capability is up to 10,500 kilograms to a station-transfer orbit, with a 3.9-meter fairing sized for Cygnus. A removable nose section permits late cargo access. Initial launch operations are assigned to Wallops, continuing the geographic connection between Antares and the Virginia spaceport.
The first-stage development also contributes to Eclipse. Antares 330 combines the new booster with an established solid upper stage, providing a specific cargo-launch configuration within the partnership. Eclipse carries that work into a larger two-stage liquid-propellant vehicle. The distinction affects payload capacity, the volume available beneath the fairing, and the upper-stage propulsion used to reach the mission’s destination.
Northrop Grumman’s Role in Eclipse
Northrop Grumman’s published division of responsibilities assigns it vehicle licensing, payload fairings and accommodation, avionics, software, guidance algorithms, and integration work. Firefly supplies propulsion and carbon-composite structures. The arrangement combines Northrop Grumman’s mission and vehicle systems with Firefly’s manufacturing and engine development, giving each partner defined responsibilities within a single launch system.
Eclipse is 59 meters long in the joint design and uses seven Miranda engines on its first stage and one Vira on its second. Both stages burn liquid oxygen and RP-1 kerosene. The March 2026 datasheet lists 16,300 kilograms to a 200-kilometer low Earth orbit, 3,200 kilograms to geosynchronous transfer orbit, and 2,300 kilograms on a translunar trajectory. Each figure describes a different mission energy requirement.
The rocket’s 5.4-meter outer-diameter fairing provides substantially more payload accommodation than Antares. Northrop Grumman specifies a roughly 4.6-meter usable payload envelope within it. The fairing protects spacecraft during ascent, and its internal envelope determines how spacecraft and deployment structures can fit. This allows Eclipse to address larger spacecraft and multi-satellite arrangements alongside its station resupply assignment.
Firefly’s Eclipse program page identifies return to the launch site and propulsive landing of the first stage as design features. The initial launch location is Virginia’s Mid-Atlantic Regional Spaceport, with first flight planned no earlier than 2027. The partners are developing the vehicle for commercial, scientific, national security, and station cargo missions, extending Northrop Grumman’s launch portfolio beyond the earlier Antares configuration.
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