When the sun’s limbs ran out of power, the weary spacecraft fell silent, out of control, and exhausted.
Reluctantly, engineers sounded the alarm for the lunar-landing CAPSTONE mission. NASA gave the team permission to make her million-mile long-range calls to small spacecraft using the Deep Space Network, a system of her three giant radio antennas on Earth. . That was their last hope.
Connected to a football-field-sized antenna, the spacecraft Capstone, which could be mistaken for a winged microwave oven, started speaking again. And for so many data points, that message home was clear. It won’t be long for me — I’m dying.
“Without electricity,” Advanced Space’s Jeff Parker told Mashable of the moment.
“Without power, the spacecraft would have been frozen.”
Few people know the first story truth The mission of Artemis, NASA’s new moon program, and how he crawled back from the brink of death in September 2022, survived two months later, and accomplished an unprecedented feat.
By the way, this was not Artemis I. In November, a new passenger spacecraft made its maiden voyage from the same famous Florida coastline that sent Apollo astronauts to the moon. No, this took off four months before her, on a sparsely populated headland in the Southwest Pacific, 8,000 miles away. There, grazing sheep and cows could sometimes lift their noses and watch rockets skim the sky.
NASA is back in business on the moon. This is what it means.
Tweet may have been deleted
(opens in new tab)
capstone [Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment] A lunar mission by a small spacecraft of the same name, launched on June 28, 2022 from Mahia, New Zealand aboard a Rocket Lab Electron rocket.
this is Purpose It was to reconnoiter an orbit around the Moon that no other spacecraft had ever flown before. key to effective planning. An outpost called Gateway serves as a base for astronauts traveling to and from the lunar surface.
Unlike normal business, NASA does not own or operate this tiny 55-pound vessel. Government agencies have chosen to partner with private companies on a mission to reduce costs and get to the launch pad faster. Terran Orbital built it, Advanced Space owned and managed the mission from Westminster, Colorado, and Rocket Lab launched it into space. From soup to nuts, the entire project cost him $30 million. That’s a tiny fraction of her over $4 billion spent on flagship missions like Artemis I.
Gateway lunar orbit
Anomalous trajectories designed to burn, known as near-linear halo trajectories [NRHO], which looks like a necklace suspended from the moon and hangs around the north and south poles. Imagine embracing the necklace tightly, about 1,000 miles above the moon’s surface and at a depth of 40,000 miles from the bottom of the moon. Flying at the summit is like getting a lunar gravity boost once a week. All the while, spacecraft on route always face Earth, allowing for constant communication.
“This is a new operation that we have never done before,” NASA administrator Bill Nelson told reporters last year. This is going into polar orbit.”
Scientists considered many potential orbits before deciding that this was the best fit for the future space station. For example, the lunar low orbit orbits very close to the surface of the moon. This will bring the base closer to the ground, but will require more fuel to counteract the moon’s gravity. , which is not very convenient for ground access. The trajectory proposed by Gateway is a Goldilocks solution that combines the best of both worlds.
Capstone was launched on June 28, 2022 on a privately owned rocket.
Credit: Rocket Lab
That’s where Capstone comes in, soaring forward, looking for bumps in the road before a larger spacecraft with humans on board arrives.
“Would you fly this multi-billion dollar gateway in a unique trajectory with just paper research, or would you feel more comfortable if the spacecraft had already demonstrated that it could do it?” Parker rhetorically said. Asked.
What went wrong with Capstone?
Capstone was launched on June 28, 2022 from Mahia, New Zealand aboard a Rocket Lab Electron rocket.
Credit: Rocket Lab
For two months, Capstone’s solo trip was spotless, uneventful, and barely noticeable. To save fuel, it traveled a scenic route and made a special travel maneuver that would take him four months to reach the moon.
It wasn’t until the normal course correction that something cataclysmic happened.
There are navigational errors in any space journey. Just as a person in a car adjusts the steering wheel while driving, so does a spacecraft. However, at the end of this engine ignition, scheduled for September 8, 2022, one thruster did not stop burning.
It only took a fraction of a second for the fault protection system to kick in and shut down the entire propulsion system. But that extra four seconds of her thrust was enough to spin the spacecraft.
The capstone spun at high speed, spinning once every five seconds, with no end in sight.
Tweet may have been deleted
(opens in new tab)
As far as anyone can guess, a small piece of debris must have gotten trapped in the thruster valves at some point and prevented them from closing.
During each rotation, the ship’s solar panels were intermittently oriented in the correct direction, absorbing the sun’s rays. So the mission engineer saw the spacecraft go in and out of consciousness over and over, once an hour.
turn on. call home. shut off. Charge. turn on. call home. shut off. Charge.
They were able to see Capstone’s signal, but did not have enough time to gather useful information.
“We couldn’t communicate with it,” Parker said, acknowledging his love for crappy boxes with mixed metal and circuitry. He is one of several of his CAPSTONE Mission Operations Managers, a title that has shortened control room chatter to “mom.”
The Capstone spacecraft weighs just 55 pounds and looks like a microwave oven with wings.
Credit: NASA / Dominic Hart
When the Deep Space Network finally made contact with Capstone and learned the spacecraft’s vitals, Parker felt something akin to his mother’s desperation. The tank was frozen. Game over, he feared.
“They’re robots,” he said of spacecraft like Capstone.
“They are robots, but when you give them a name and sometimes a gender, they become attached.”
i want more science and tech news delivered straight to your inbox? Sign up for Mashable’s Top Stories newsletter today.
How Capstone stopped spinning
Tweet may have been deleted
(opens in new tab)
Without many options, the team intentionally put Capstone into a coma and turned off all systems to save power.
After sleeping for days, they waited.
Mission controllers then turned on only one heater to thaw the fuel tanks and attempted to activate it. Gradually they convinced themselves that they could turn on another heater. Over the course of a week, Capstone was slowly brought to room temperature.
The team tried to remove the stuck valve. Engineers repeatedly issued harsh commands in the hope that the jam could be loosened. Open! near! Open! near!
Nothing worked and flicking it on and off actually spun the ship in a more dizzying clip.
Tweet may have been deleted
(opens in new tab)
That meant I had to learn to live with a bum thruster that wouldn’t stop firing as long as the propulsion system was on. So they learned to work with their handicaps. The guidance and navigation team used data and computer simulations to create a new controller for the spacecraft. If one thruster fails to stop, strategically fire her two other thrusters simultaneously to overwhelm it.
Now it’s time to test the new controller in real life. On October 7, 2022, Advanced Spaces began restoration work. And just like that, a month after the fall began, the death spiral ended.
“Would you fly this multi-billion dollar gateway in a unique trajectory with just paper research, or would you feel more comfortable if the spacecraft already demonstrated it could do it?”
Was the capstone mission successful?
Tweet may have been deleted
(opens in new tab)
Since then, Capstone has thrived, reaching its own orbit on November 13, 2022, just before NASA’s MegaMoon rocket launched Orion into the sky. It will stay there for up to 1.5 years, collecting data for NASA and testing several new onboard devices, including GPS software and computer chip-scale atomic clocks. It could be used to help lunar spacecraft find their position without resorting to expensive resources.
After this tiny spacecraft completes its primary mission, it can either stay on the Moon to continue its navigational experiments, or do what it’s most coveted for after retirement: seeing the world.In this case, rather than other world.
Who knows, Parker’s muse? Maybe even visit an asteroid.
The spaceship’s life may have been cut short by the brush of death, but many Capstone moms believe its best years are ahead.
“Even in the darkest moments, when you find out that what you’re flying in is a frozen solid spaceship that’s spiraling out of control, you still have hope.
