26 July 2016 High-precision astrometry towards ELTs
Author Affiliations +
With the aim of paving the road for future accurate astrometry with MICADO at the European-ELT, we performed an astrometric study using two different but complementary approaches to investigate two critical components that contribute to the total astrometric accuracy. First, we tested the predicted improvement in the astrometric measurements with the use of an atmospheric dispersion corrector (ADC) by simulating realistic images of a crowded Galactic globular cluster. We found that the positional measurement accuracy should be improved by up to ∼ 2 mas with the ADC, making this component fundamental for high-precision astrometry. Second, we analysed observations of a globular cluster taken with the only currently available Multi-Conjugate Adaptive Optics assisted camera, GeMS/GSAOI at Gemini South. Making use of previously measured proper motions of stars in the field of view, we were able to model the distortions affecting the stellar positions. We found that they can be as large as ∼ 200 mas, and that our best model corrects them to an accuracy of ∼ 1 mas. We conclude that future astrometric studies with MICADO requires both an ADC and an accurate modelling of distortions to the field of view, either through an a-priori calibration or an a-posteriori correction.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Davide Massari, Davide Massari, Giuliana Fiorentino, Giuliana Fiorentino, Eline Tolstoy, Eline Tolstoy, Alan McConnachie, Alan McConnachie, Remko Stuik, Remko Stuik, Laura Schreiber, Laura Schreiber, David Andersen, David Andersen, Yann Clénet, Yann Clénet, Richard Davies, Richard Davies, Damien Gratadour, Damien Gratadour, Konrad Kuijken, Konrad Kuijken, Ramon Navarro, Ramon Navarro, Jörg-Uwe Pott, Jörg-Uwe Pott, Gabriele Rodeghiero, Gabriele Rodeghiero, Paolo Turri, Paolo Turri, Gijs Verdoes Kleijn, Gijs Verdoes Kleijn, } "High-precision astrometry towards ELTs", Proc. SPIE 9909, Adaptive Optics Systems V, 99091G (26 July 2016); doi: 10.1117/12.2232478; https://doi.org/10.1117/12.2232478


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