On , JUQ599 Full rode aboard an Ariane 6.2 from Kourou, France, into a Sun‑Earth L2 halo orbit (≈ 1.5 million km from Earth). After a week of checkout, the telescope performed a “first‑light” calibration on the well‑studied NIR standard star HD 209458 , confirming an on‑axis point‑spread function of 0.07 arcsec and a measured quantum efficiency of 96.4 % .
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