The stability of China’s first space station Tiangong-1 is under question. Chinese authorities have made no public statements to declare the exact time the eight-ton uncrewed spacecraft will come back to Earth, leading to speculation that it may end up in a dangerous uncontrolled fall.
Since its launch in 2011, Tiangong-1 has conducted six rendezvous and docking missions with three Shenzhou spacecrafts. It exceeded its planned two-year operational lifespan, and entered itsextended application phasein 2013.
Amateur satellite tracker Thomas Dorman worries that China has lost control of Tiangong-1 afterXinhuareported in March that the data-gathering activities of the spacecraft had come to an end.
Dorman has been tracking the movements of Tiangong-1 since its launch and backs his concern with images taken from the ground suggesting that the space station’s solar panels are no longer oriented towards the sun,Space.com reports. He says that if he is right, “China will wait until the last minute to let the world know it has a problem with their space station.”
Dean Cheng — senior research fellow at an Asian Studies center of a Washington-based think tank — is quoted by Space.com as agreeing with Dorman’s speculations.
Cheng said that he was surprised that Chinese authorities have not declared the exact time the space station will come back to earth, even though its operation life seems to be over, speculating, “that would seem to suggest that it’s not being deorbited under control.”
Another expert is much more optimistic about China’s space program. T.S. Kelso — senior research astrodynamicist at the Center for Space Standards & Innovation — gave an alternative reading of Tiangong-1’s condition, saying that the spacecraft is dormant but stable.
“So that might be why the Chinese aren’t responding … they probably don’t understand why they would need to,” Kelso told Space.com.
In an article unrelated to Tiangong-1, Sebastian Willems, a researcher at the German space agency, is quoted by the BBC as saying that “typically one big object re-enters the Earth’s atmosphere every three-to-four days.”
Mission controllers plan how the satellites return to Earth by using their remaining fuel to push them on controlled trajectories to burn up over remote areas of ocean. “It is the unplanned re-entries of dead spacecraft that are of greater concern,” said Willems. He adds that the recent unplanned re-entry of NASA’s six-ton Upper Atmosphere Research Satellite (UARS) in 2011 had a 1 in 2,500 chance of causing a casualty.
“It could be a real bad day if pieces of this came down in a populated area … but odds are, it will land in the ocean or in an unpopulated area,” Dorman himself said.
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