In September 2026, Chinese researchers were reported to have described transferring room-temperature propellant to a high-orbit BeiDou navigation satellite. Their paper was reported to be under peer review.
What the reported BeiDou claim describes
The researchers’ account describes a transfer of propellant between spacecraft, using propellant handled at room temperature. The claim concerns a BeiDou navigation satellite; the reported account does not name the spacecraft involved.
In-orbit refueling means transferring propellant to a satellite already in space. That is different from a servicing craft approaching or docking with another spacecraft without transferring fuel.
Why refueling a satellite in orbit could matter
A satellite’s propellant supports maneuvers that help it operate in orbit. If a servicing spacecraft can replenish that supply, the satellite could have more time to carry out its mission before it needs to be replaced. That is the potential value of orbital refueling—not a reported service-life result for this BeiDou claim.
A separate Shijian-25 and Shijian-21 approach
In 2025, satellite trackers observed Shijian-25 approach Shijian-21. Some observers interpreted that separate proximity activity as possible refueling.
An approach brings spacecraft near one another; a refueling operation also requires propellant to pass between them. The Shijian-25 and Shijian-21 episode is distinct from the reported transfer involving a BeiDou satellite.
