EXOS outlines LOXSAT 11 tests

EXOS on May 19 highlighted LOXSAT, a NASA-backed orbital demonstration that is set to test 11 cryogenic fluid-management technologies in space. NASA said the mission will run for nine months in low Earth orbit and is designed to address handling of liquid oxygen in microgravity, a requirement for future in-space refueling and propellant depot concepts. (nasa.gov) Eta Space built the payload, while Rocket Lab is providing the Photon spacecraft bus and Electron launch services. The mission has drawn attention because cryogenic propellants such as liquid oxygen offer high performance but are difficult to store for long periods without losses. (nasa.gov) NASA said LOXSAT’s test set was chosen to address core problems including boiloff, propellant transfer, tank pressure control and propellant gauging. Rocket Lab said the work is intended to inform the design of Cryo-Dock, Eta Space’s planned commercial propellant depot. ### Which companies are doing what on LOXSAT? Eta Space of Rockledge, Florida, is the payload developer and prime industry partner on the mission, NASA said. The agency said LOXSAT was built under a NASA Tipping Point opportunity, while Rocket Lab integrated the payload with its Photon satellite bus and will launch it on Electron. (nasa.gov) Rocket Lab said it was selected by Eta Space in 2020 to provide both the spacecraft and launch vehicle. The company completed the Photon spacecraft and cleared a systems integration review in 2025, allowing the program to move into environmental testing ahead of launch. ### What exactly will the 11 experiments test in orbit? (nasa.gov) NASA said the 11 demonstrations focus on the main operational problems of using super-cold propellants in microgravity. Those include reducing boiloff, transferring propellant between systems, maintaining tank pressure and measuring propellant levels accurately on orbit. Eta Space said the mission will also test zero-loss storage and transfer and cryogenic pressure control. (nasa.gov) Rocket Lab said LOXSAT will test the ability to store liquid oxygen in a zero-loss configuration, which Bill Notardonato, Eta Space’s chief executive, has linked to the company’s longer-term depot plans. ### Why is liquid oxygen management such a hard problem in space? Rocket Lab said cryogenic propellants can vaporize as temperatures rise, causing propellant loss on orbit. (rocketlabcorp.com) NASA said the LOXSAT technology set was selected specifically to address those challenges in microgravity, where settling, gauging and pressure behavior differ from ground conditions. NASA said data from the tests will support future in-space propellant depots that could refuel spacecraft on missions to the Moon, Mars and other deep-space destinations. (nasa.gov) In a NASA description of the mission, the agency compared such depots to “gas stations in space.” ### Where does EXOS fit into the story? (etaspace.com) EXOS did not identify itself in NASA’s or Rocket Lab’s mission descriptions as a prime contractor on LOXSAT. EXOS’s public materials say the company has expanded into cryogenic tank technologies and orbital transfer vehicle work centered on liquid-oxygen and methane systems. The company’s May 19 social-media post framed LOXSAT as evidence of the broader push to solve in-space refueling and cryogenic storage problems. That aligns with EXOS’s own stated focus on cryogenic tank systems for orbital applications, according to its corporate materials. (rocketlabcorp.com) ### When is the mission supposed to fly? NASA said on May 14 that LOXSAT is scheduled to launch aboard Rocket Lab’s Electron rocket from Launch Complex 1 on New Zealand’s Mahia Peninsula no earlier than July 17. Eta Space’s mission page also says LOXSAT will launch in 2026 on Electron and remain in low Earth orbit for nine months, while Rocket Lab has said the mission will use its Photon platform as the host spacecraft. (nasa.gov) (exosaero.com)