Interorbital Systems (IOS), established in 1996, develops and manufactures low-cost, state-of-the-art manned and unmanned orbital launch vehicles for commercial, governmental, and military applications. IOS rockets are designed to be launched from land or sea. 

Two orbital launch vehicles are currently under development at IOS: the unmanned Sea Star TSAAHTO, and the manned/unmanned Neptune TSAAHTO. Each utilizes the innovative and efficient Two-Stage-And-A-Half-To-Orbit (TSAAHTO) configuration. The six-passenger Neptune TSAAHTO will serve as the primary carrier in Interorbital Systems' orbital tourism operations and Lunar exploration ventures. Interorbital Systems is currently involved in the launch licensing process with the AST (Office of Commercial Space Transportation).  The license will allow IOS to conduct polar-orbital launches of its Sea Star TSAAHTO rocket from the Pacific Ocean off the coast of Southern California.

Latest News!

Interorbital Taps Destiny Space to Book Space Tourism & Sat Launches
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Interorbital Releases Neptune Rocket Design; Readies for MSLV Flight
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Interorbital Systems and European Philanthropic Organization ‘Vision One’ Join Forces in Space Venture
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Sea Star TSAAHTO Flight Demonstrator Modular Tankage Section Nears Completion
IOS is progressing with the construction of its Sea Star TSAAHTO orbital rocket. A demonstration launch to test guidance, telemetry, and the ocean launch system is upcoming. The rocket is designed to place a 45-pound (20.4-Kg) in polar low-earth- orbit.

Interorbital Systems Opens European Liaison Office!
Located in Berlin, Germany, IOS Europe will provide satellite launch service information, Orbital Expedition Spaceline ticket reservations, and customer service for the European Community. Click Here

Neptune TSAAHTO Crew Module (CM) Flight Training Simulator Phase I Construction Completed!
The basic exterior and interior structure of the six-passenger CM (below) is complete; IOS Spacecraft Technicians and Engineers have begun Phase II: installing electronic systems and flight-simulator software.

Detailed trajectory analysis of the Sea Star TSAAHTO rocket has been completed!
Leon McKinney of McKinney Associates has completed a POST and OTIS analysis of the Sea Star TSAAHTO rocket. The results verified the orbital and payload capability of the design. Construction of the vehicle is underway.

Interorbital Systems P.O. Box 662 Mojave, CA 93502-0662
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