That would happen sometime in February, a few weeks before the crew is set to return in March, officials said.
The crew that would fly home on the rescue craft would include NASA astronaut Frank Rubio and a pair of cosmonauts, Sergey Prokopyev and Dmitri Petelin, who arrived at the station in September.
On Dec. 14, as a pair of cosmonauts were preparing to exit the station for a spacewalk, ground controllers at Roscosmos and NASA detected a leak of coolant gushing controllably from the Soyuz capsule.
Roscosmos quickly canceled the spacewalk. And after inspecting the vehicle with the station’s robotic arm, they determined the leak was from an external cooling line used to keep the capsule at a comfortable temperature as it transports crews through the atmosphere into the vacuum of space.
In a statement last week, NASA said that “none of the crew members aboard the station was in danger, and all conducted normal operations throughout the day.” It added that, “images and data are being analyzed by Roscosmos. The agency also is closely monitoring Soyuz spacecraft temperatures, which remain within acceptable limits. NASA and Roscosmos are continuing to work together on a course of action following the ongoing analysis.”
None of the coolant contaminated the space station, said Joel Montalbano, NASA’s space station manager, and the astronauts on the station continue to conduct science experiments, including growing tomatoes.
It is not clear what caused the leak. Montalbano said possible causes being investigated are a failure of hardware on the craft or possible damage from a piece of debris or a micro meteorite.
On Wednesday, NASA canceled a spacewalk to install an upgraded solar array because a piece of debris was expected to come within a quarter-mile of the station. Crews maneuvered the station to avoid the debris, and the spacewalk was rescheduled for Thursday.