Euclid: Astronomers are NOT Engineers.

Summary: The ESA people in charge of the mission were astronomers. They did not talk to their engineers about what our star would do to the telescope's sensors or to the navigation and pointing sensors. The stray light and high energy particles from it, clouded the detectors involved with “static”, creating “snow” on the images that Euclid saw or sent back to Earth. The telescope will have its mission degraded to some degree, as the directions and times the telescope can look will have to be further restricted than hoped,

Furthermore, it appears that the telescope's lack of a spurious “noise to true signal” discriminator will still input a higher than expected contamination of high energy particles from our galactic center to wanted starlight photons.

Euclid will thus have to be carefully managed to produce survey results with less time and less sky sweeps than expected.

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