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posted by janrinok on Friday March 29, @05:10PM   Printer-friendly

Arthur T Knackerbracket has processed the following story:

A newly devised procedure to de-ice Euclid's optics has performed significantly better than hoped. Light coming in to the visible "VIS" instrument from distant stars was gradually decreasing due small amounts of water ice building up on its optics. Mission teams spent months devising a procedure to heat up individual mirrors in the instrument's complex optical system, without interfering with the finely tuned mission's calibration or potentially causing further contamination. After the very first mirror was warmed by just 34°, Euclid's sight was restored.

Euclid is on a mission to uncover the secrets of dark matter and dark energy, which are thought to make up 95% of the universe yet cannot be directly observed. But a few nanometers of ice—the width of a large molecule—have been accumulating on the mission's optics each month, causing a drop in the light coming in from distant galaxies.

[...] "It was an enormous team effort over the last months to plan, execute and analyze the heating of selected mirrors onboard Euclid, resulting in the fantastic result we see now," explains Ralf Kohley, Euclid instrument scientist and in charge of the anomaly review board.

"The mirrors, and the amount of light coming in through VIS will continue being monitored, and the results from this first test will continue to be analyzed as we turn this experiment into a core part of flying and operating Euclid."

One by one, then group by group, they planned to heat up mirrors in Euclid's optics and test the effect on the light coming in. They had reason to believe, but couldn't know for sure, that the first mirror they would heat was causing most of the problems.

"It was midnight at ESOC mission control when we de-iced the first two mirrors in the procedure. We were very careful with our timings, ensuring we had constant contact between the spacecraft and our ground station in Malargüe, Argentina, so we could be ready to react in real time if there were any anomalies," explains Micha Schmidt, Euclid Spacecraft Operations Manager.

"Thankfully, it all went as planned. When we saw the first analysis provided by the science experts, we knew that they would be very happy—the result was significantly better than expected."

[...] "Our primary suspect, the coldest mirror behind the main telescope optics, was heated from –147°C to –113°C. It didn't need to get hot, because in a vacuum this temperature is enough to quickly evaporate all the ice. And it worked like a charm! Almost immediately, we were receiving 15% more light from the universe. I was certain that we would see a considerable improvement, but not in such a spectacular way."

With Euclid's vision cleared at the very first stage of the procedure, scientists and engineers could tell where precisely the ice had formed, and where it is likely to form again. "Euclid's 'eye' has been cleared, allowing it to clearly see faint light from distant galaxies, and more of them than would otherwise be possible without this operation," explains Reiko Nakajima, VIS instrument scientist.

"We expect ice to cloud the VIS instrument's vision again in the future. But it will be simple to repeat this selective decontamination procedure every six to 12 months and with very little cost to science observations or the rest of the mission help future satellites likely to face the same, common icy problem.


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  • (Score: 2) by hendrikboom on Saturday March 30, @12:25AM (2 children)

    by hendrikboom (1125) Subscriber Badge on Saturday March 30, @12:25AM (#1350949) Homepage Journal

    So where is this ice coming from. Is Euclid flying through a fogbank?

    • (Score: 2, Informative) by Anonymous Coward on Saturday March 30, @01:11AM (1 child)

      by Anonymous Coward on Saturday March 30, @01:11AM (#1350955)

      So where is this ice coming from. Is Euclid flying through a fogbank?

      This is explained in TFA:

      During ESA Euclid’s first months in space, some water molecules absorbed from the air, during assembly on Earth, by parts of the spacecraft were being gradually released. Cold surfaces like the mirrors in Euclid’s instruments tend to attract these molecules, where they formed a very thin layer of ice ...

  • (Score: 4, Funny) by Ingar on Saturday March 30, @10:12AM

    by Ingar (801) on Saturday March 30, @10:12AM (#1350991) Homepage

    That's 0.5934 radians!

  • (Score: 4, Funny) by Thexalon on Saturday March 30, @10:54AM

    by Thexalon (636) on Saturday March 30, @10:54AM (#1350994)

    I thought Euclid had been dead for a while, so making him see again is an amazing feat of medicine!

    --
    The only thing that stops a bad guy with a compiler is a good guy with a compiler.
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