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11 July 2018 The MICADO first light imager for ELT: its astrometric performance
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Abstract
We report on our ongoing efforts to ensure that the MICADO NIR imager reaches differential absolute (often abbreviated: relative) astrometric performance limited by the SNR of typical observations. The exceptional 39m diameter collecting area in combination with a powerful multi-conjugate adaptive optics system (called MAORY) brings the nominal centroiding error, which scales as FWHM/SNR, down to a few 10 μas. Here we show that an exceptional effort is needed to provide a system which delivers adequate and calibrateable astrometric performance over the full field of view (up to 53 arcsec diameter).
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J.-U. Pott, G. Rodeghiero, H. Riechert, D. Massari, M. Fabricius, C. Arcidiacono, and R. I. Davies "The MICADO first light imager for ELT: its astrometric performance", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070290 (11 July 2018); doi: 10.1117/12.2312069; https://doi.org/10.1117/12.2312069
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