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IIRC Gaia had a performance degradation because of stray light, probably ice on the border of it's aperture[1].

How has that affected this result?

[1] https://blogs.esa.int/gaia/2014/06/16/preliminary-analysis-o...

It was not ice, but fibers from the sun shield. The ice issue was resolved by heating the satellite. The stray light issue affected spectra measurements, but not the astrometric side of the mission

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