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Home»Latest Science»Russian module suddenly fires thrusters after docking with space station
Latest Science

Russian module suddenly fires thrusters after docking with space station

NewsBy NewsJuly 29, 2021Updated:July 30, 2021No Comments4 Mins Read
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Enlarge / Russian “Nauka” module approaches the International Space Station.

Flight controllers at NASA and Roscosmos averted a disaster on Thursday after a large Russian module docked with the International Space Station and began to “inadvertently” fire its thrusters.

The Russian “Nauka” module linked to the space station at 8:30 am CT (13:30 UTC), local time in Houston, where NASA’s Mission Control is based. After that, Russian cosmonauts aboard the station began preparing to open the hatches leading to Nauka, but at 11:34 am Houston time, Nauka unexpectedly started to fire its movement thrusters.

Within minutes, the space station began to lose attitude control. This was a problem for several reasons. First of all, the station requires a certain attitude to maintain signal with geostationary satellites and talk to Mission Control on the ground. Also, solar arrays are positioned to collect power based upon this predetermined attitude.

Another concern is G forces on the station’s structure. The various components of the extensive space station were assembled in microgravity and designed to operate at zero-G. So even small stresses on the vehicle can induce small cracks or other problems with the station’s structure.

For all of these reasons, space station flight controllers in Houston and Moscow acted quickly after the station started to drift. Attitude control was fully lost at 11:42 am, and engines on the space station’s service module were fired. This was followed by a handover to the Russian Progress vehicle attached to the station, which began to fire its thrusters. This tug-of-war offset the Nauka module thruster activity, which eventually stopped after fuel supplies were exhausted. By 12:29 pm on Thursday, attitude control was restored. It made for quite an hour on the ground and in space.

“Yeehaw!” tweeted Zebulon Scoville, lead flight director in Houston during Thursday’s space station activities, after his shift ended. “That. Was. A. Day.”

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By late Thursday afternoon, when NASA officials held a teleconference to brief reporters, the situation appeared to be well in hand. Officials, however, declined to say how serious the situation got in Mission Control before the station returned to its proper attitude.

“Until you exhaust all your contingency plans, you’re not really starting to worry,” said NASA’s space station program manager Joel Montalbano. “And we didn’t do that today.”

Already, Montalbano said, a team of NASA engineers was studying the effect of Thursday’s loss of control on the station’s structure. Meanwhile, Russian engineers were assessing the health of the Nauka module. Both groups should complete preliminary assessments by the end of the day Friday.

For NASA, this meant delaying the launch of a Starliner spacecraft planned for Friday. This long-awaited mission comes 19 months after an initial test flight in December 2019 went awry due to software problems. Because Starliner was not able to dock with the space station during this first test flight, Boeing agreed to fly a second test mission of Starliner before a crewed flight.

NASA moved the Starliner launch to no-earlier-than Tuesday at 1:20 pm EDT from Florida (17:20 UTC) on its Atlas V rocket. If the spacecraft launches next Tuesday and all goes well, Starliner will dock with the space station next Wednesday.

Russia's Nauka module is seen attached to the International Space Station.
Enlarge / Russia’s Nauka module is seen attached to the International Space Station.

Roscosmos

Meanwhile, the Russians will continue to work toward integrating Nauka with the space station. This is a sizable module that includes crew quarters, an airlock for scientific experiments, and much more. With a mass of about 24 metric tons, it is roughly 20 percent larger than the biggest Russian segment of the station, the Zvezda service module.

Nauka has had a long and, so far, inglorious history. Its launch eight days ago came after more than a decade of delays due to lack of funds and technical problems. Shortly after reaching orbit, Russia had difficulties with Nauka’s main propulsion system, and docking with the space station was delayed. After using backup thrusters to raise its altitude and reach the station, Nauka docked. It’s not clear what role the propulsion system issues experienced shortly after the launch may have played in Thursday’s difficulties.

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