Interorbital Systems (IOS) is a rocket, satellite, and spacecraft manufacturing company and launch-service provider founded in 1996 by Roderick and Randa Milliron. Interorbital's innovative modular launch vehicle, the NEPTUNE, is poised to provide the world's lowest-cost access to space. Combined with IOS' STEM products, the TubeSat and CubeSat Personal Satellite Kits, IOS is committed to providing reliable and affordable space-launch solutions.

Company Timeline

  1. NASA SBIR Awarded

    November 11, 2011

    Interorbital Systems won a NASA SBIR contract for its program, "NEPTUNE Modular Rockets for Breakthrough Low-cost Space Access." The contract awards IOS with funding to further develop their innovative dedicated small satellite launch vehicle

  2. Thruster Test Firing

    May 27, 2012

    At its Mojave Air and Space Port test facility, Interorbital Systems successfully completed its first hot-firing of the new Vernier engine. These thrusters provide roll control on IOS rockets

  3. GPRE Test Firing

    October 28, 2012

    Interorbital Systems completed the first hot-firing of its 7,500-lb thrust General Purpose Rocket Engine (GPRE), the workhorse of the IOS NEPTUNE series rockets. The test was a success, confirming expected performance for the engine

  4. Rocket Engine Qualification

    October 21, 2013

    IOS successfully completed a final test of the main propulsion system for CPM 1.0, which guaranteed the engine's functionality for the upcoming launch of the CPM 1.0

  5. CPM TV Launch

    March 29, 2014

    Interorbital Systems successfully completed the first launch its Common Propulsion Module Test Vehicle (CPM TV). The CPM 1.0 is the first iteration of the NEPTUNE Rocket Series building-block. Both rocket and contracted payloads were recovered intact

  6. MLLS Completed

    December 6, 2015

    Interorbital completed testing of its Mobile Land-Launch System (MLLS). The completely mobile system allows IOS NEPTUNE rockets to be easily transported and launched from any site, increasing launch location flexibility

  7. Filament Winder Completed

    October 2, 2016

    IOS completed construction of its carbon-composite filament winder. The machine quickly and easily manufactures light, high-strength composite rocket tankage and components, increasing IOS' ability to swiftly manufacture launch vehicles

  8. First TubeSat in Orbit

    January 19, 2017

    The first Interorbital Systems' TubeSat was deployed into orbit from the International Space Station's Kibo Module. The TubeSat is the world's least expensive satellite kit. The Brazilian satellite, Tancredeo 1, functioned fully in space, proving the kit's on-orbit viability

  9. CPM 2.0 Completed

    April 23, 2017

    Assembly of the prototype for Interorbital Systems' new CPM 2.0 was completed. The CPM 2.0 is an evolved launch vehicle that is easier and cheaper to manufacture, with improved performance over CPM 1.0. the CPM 2.0 is the 'LEGO'in IOS' NEPTUNE modular rockets


Low-Cost Orbital Launch Vehicle

In keeping with its goal of lowering launch costs and making orbital tranport more affordable to a wider customer base, IOS currently offers the world's lowest-cost orbital launch services with its NEPTUNE-Series rockets

NASA SBIR Recipient

Interorbital Systems is funded by private, commercial, and government sources. Acknowledged by NASA as an industry leader, IOS won a NASA SBIR contract in 2011

Vertical Integration

In order to provide the lowest-cost and most reliable launches for its customers, IOS manufactures the majority of its launch vehicle components and satellite kits in-house, using off-the-shelf secondary components wherever possible

Proven Satellite Technology

IOS TubeSats have been successfully deployed into Low Earth Orbit and used for communications and experimentation

Flexible Launch Methods

The Mobile Land-Launch System (MLLS) and Canister Ocean-Launch System (COLS) allow IOS customers to launch rockets from almost any location, increasing scheduling and inclination flexibility while avoiding expensive spaceport fees

Mojave Air and Space Port

Interorbital Systems is located at the Mojave Air and Space Port in Mojave, California. A hotbed of innovation in the private space industry, the spaceport boasts manufacturing facilities, hangars, dedicated test sites, and a large pool of space engineering talent. IOS was one of the first companies to establish itself in 1996 at the now-bustling spaceport, which was the first US spaceport licensed for horizontal launches of reusable spacecraft.

In a day at the spaceport, it is common to see vintage trainer airplanes from the nearby flight school flying alongside experimental aircraft and spacecraft. Rumbles and dust plumes in the distance indicate rocket engine tests, and fighter jets from nearby Edwards Air Force Base scream overhead in tight formation. It's a place where engineers and visionaries come together with test pilots and space industry veterans to push the envelope in the private space industry.