space tug
space tug

NASA wants more ‘space tug’ ideas to deorbit the International Space Station in a fiery finale

NASA is asking U.S. industry for proposals to create a “space tug” for removing the International Space Station from orbit in the early 2030s.

The agency plans to use a U.S. Deorbit Vehicle (USDV) to safely steer the International Space Station (ISS) into Earth’s atmosphere. (White House officials previously called this vehicle a “space tug.”) If all goes according to NASA’s plan, after the ISS program concludes, flights and commercial research will  proceed on industry-led space stations, which are now in their early stages of development.

USDV proposals are due on Nov. 17, and more details about the requirements are available on this U.S. government website. NASA is allowing vendors to suggest much of the design of the vehicle as well as the best payment type: firm fixed price, or cost plus incentive fee for each of the initial phases (design, development, test and evaluation) to be followed by firm fixed price.

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“At the conclusion of the International Space Station program, the station will be deorbited in a controlled manner to avoid populated areas,” NASA officials wrote in a blog post Sept. 20 announcing the request for proposals.

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A Russian Progress cargo vehicle, which is usually used to boost the ISS’ orbit periodically, they added, would not be sufficient for the job. As such, “a new spacecraft solution would provide more robust capabilities for responsible deorbit.”

space tug

NASA emphasized that the USDV would be responsible for deorbiting the U.S. segment, but did not provide details on how the other main international partners would remove their sections from orbit. “Partner contributions (are) based on mass percent ownership by agency,” NASA officials said, framing the ISS deorbit as “a shared responsibility” among the partnership.

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The USDV, they added, “will be a new spacecraft design or modification to an existing spacecraft that must function on its first flight, and have sufficient redundancy and anomaly recovery capability to continue the critical deorbit burn. As with any development effort of this size, the USDV will take years to develop, test and certify.”

The other main partners on the ISS (listed in order of size of contribution, starting with the largest) include the Russian federal space agency Roscosmos, the European Space Agency, the Japan Aerospace Exploration Agency and the Canadian Space Agency (CSA).

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With the exception of the CSA, these partners all have at least one module on station. The CSA has robotics, namely Canadarm2, the Dextre handyman robot and supporting infrastructure.

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With the exception of Roscosmos, the other partners have agreed to remain on station with NASA until 2030. Russia will withdraw no earlier than 2028 to pursue its own space exploration plans. Space partnerships with Russia were mostly severed after its internationally condemned invasion of Ukraine in February 2022, which is ongoing. But ISS relations remain normal in the meantime, NASA has emphasized.

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About the author

Naqvi Syed

Naqvi Syed is is a freelance journalist who has contributed to several publications, including Spacepsychiatrist. He tackles topics like spaceflight, diversity, science fiction, astronomy and gaming to help others explore the universe. He works with Spacepsychiatrist from a long time.


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