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Peregrine lander: US Moon mission on course for fiery destruction
Published in The Saudi Gazette on 18 - 01 - 2024

The US company that was hoping to land on the Moon will bring its mission home to destruction in the coming hours.
Astrobotic says its Peregrine spacecraft will be directed to re-enter the Earth's atmosphere and burn up.
The lander suffered a major propellant leak shortly after launching from Florida on its Vulcan rocket last week.
Although engineers were able to stabilize the situation, the loss of oxidizer meant a safe touch-down on the lunar surface could never be attempted.
Pittsburgh-based Astrobotic has decided to dispose of the craft, rather than let it wander aimlessly through space, posing a collision hazard.
"Astrobotic has positioned the Peregrine spacecraft for a safe, controlled re-entry to Earth over a remote area of the South Pacific. The team has been continuously monitoring our re-entry analysis with [the US space agency, Nasa]," the company said in its latest mission update.
"We expect re-entry to occur at approximately 16:00 Thursday, January 18 EST (21:00 GMT)."
Astrobotic's goal had been to deliver five Nasa instruments to the Moon's surface, to study the local environment ahead of the return of astronauts later this decade.
Had the Peregrine craft been able to land successfully, it would have become the first American mission in half a century to do so, and the first ever private venture to achieve the feat.
Only government agencies from the US, the Soviet Union, China and India have managed controlled lunar landings to date.
But Astrobotic can console itself with what it did manage to accomplish from a difficult situation.
Engineers were able to diagnose what went wrong with Peregrine and then eke out life in the lander far beyond what seemed possible at the start.
The fault was traced to leaking propellant from a ruptured oxidiser tank. This was generating a thrust, turning the craft and preventing it from keeping its solar panels constantly pointed at the Sun — vital to maintain a power supply.
The Astrobotic team worked the thrusters on Peregrine to restore stable pointing, but this of course used up even more of the rapidly depleting oxidiser.
Nonetheless, payloads onboard were activated, proving their space-worthiness, and some were even able to gather data, such as on the nature of the radiation environment between Earth and the Moon.
One of the Nasa instruments to be started up — the Peregrine Ion Trap Mass Spectrometer (PITMS) — had its sensor and electronics developed in the UK by the Open University and RAL Space.
The instrument was reported to be performing well in the check-out tests. The technology should have the opportunity to fly again on later lunar missions.
Astrobotic is the first of three US companies to send a lander to the Moon this year under a new private-public partnership with Nasa.
The agency is buying transport services from the Pittsburgh firm and two other commercial ventures — Intuitive Machines and Firefly. Together, the trio had planned six missions to the lunar surface in 2024.
Astrobotic should get a second go in the back half of the year when it tries to land a Nasa rover called Viper. Houston-based Intuitive Machines' first attempt is likely to launch next month. Its Nova-C craft will be aimed at the lunar south pole.
Before then, the Japanese space agency will try to put down safely close to a near-equatorial impact crater called Shioli. This event is scheduled for 15:20 GMT on Friday. — BBC


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