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Proceedings

GeMS/GSAOI: towards regular astrometric distortion correction

MPS-Authors

Riechert,  Hannes
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Garrel,  Vincent
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pott,  Jörg-Uwe
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sivo,  Gaetano
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marin,  Eduardo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018SPIE10702E..32R
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Citation

Riechert, H., Garrel, V., Pott, J.-U., Sivo, G., & Marin, E. (2018). GeMS/GSAOI: towards regular astrometric distortion correction.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CB7E-A
Abstract
The GeMS/GSAOI pair has been in regular science operation since 2013 at the Gemini South telescope and regularly delivers close to diffraction limited imaging in the NIR bands over a wide field of view of 85" square. Although the original GeMS/GSAOI science cases intentionally did not specify any astrometric performance, the Gemini users community expressed a large interest into using it with this purpose. Both instruments are subject to gravity-induced flexures. GSAOI is often dismounted from the telescope in instrument exchanges, making a regular on-sky calibration strategy time prohibitive. In 2017, we installed a new GeMS calibration focal plane mask offering 1600 pinhole sources with a position accuracy of +/-25 μm equivalent to +/-0.4 mas, which can be used to deliver distortion calibration. We evaluate the flexure effect in the GeMS/GSAOI pair and discuss how to facilitate the mask to calibrate intra-night distortion drifts.