Tip-tilt anisoplanatism in MCAO-assisted astrometric observations

Giulia Carlà; Lorenzo Busoni; Cédric Plantet; Guido Agapito; Carmelo Arcidiacono; Paolo Ciliegi

doi:10.1117/12.2627126

29 August 2022 Tip-tilt anisoplanatism in MCAO-assisted astrometric observations

Giulia Carlà, Lorenzo Busoni, Cédric Plantet, Guido Agapito, Carmelo Arcidiacono, Paolo Ciliegi

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121850O (2022) https://doi.org/10.1117/12.2627126
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

A new era of ground-based observations, either in the infrared with the next-generation of 25-40m extremely large telescopes or in the visible with the 8m Very Large Telescope, is going to be assisted by multi-conjugate adaptive optics (MCAO) to restore the unprecedented resolutions potentially available for these systems in absence of atmospheric turbulence. Astrometry is one of the main science drivers, as MCAO can provide good quality and uniform correction over wide field of views (∼ 1 arcmin) and offer a large number of reference sources with high image quality. The requirements have been set to very high precisions on the differential astrometry (e.g. 50μas for MICADO/MORFEO - formerly known as MAORY - at the Extremely Large Telescope) and an accurate analysis of the astrometric error budget is needed. In this context, we present an analysis of the impact of MCAO atmospheric tip-tilt residuals on relative astrometry. We focus on the effects of the scientific integration time on tip-tilt residuals, that we model through the temporal transfer function of the exposure. We define intraand inter-exposure tip-tilt residuals that we use in the estimation of the centroiding error and the differential tilt jitter error within the astrometric error budget. As a case study, we apply our results in the context of the MORFEO astrometric error budget.

Conference Presentation

Citation Download Citation

Giulia Carlà, Lorenzo Busoni, Cédric Plantet, Guido Agapito, Carmelo Arcidiacono, and Paolo Ciliegi "Tip-tilt anisoplanatism in MCAO-assisted astrometric observations", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121850O (29 August 2022); https://doi.org/10.1117/12.2627126

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