@inproceedings{7f03f1cc1afa4eb097e2705bc4a8971a,
title = "GeMS/GSAOI: Towards regular astrometric distortion correction",
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.",
keywords = "GeMS, astrometry, diffraction-limit, mask calibration, multi-conjugate adaptive optics, near-infrared",
author = "Hannes Riechert and Vincent Garrel and Pott, \{J{\"o}rg Uwe\} and Gaetano Sivo and Eduardo Marin",
note = "Publisher Copyright: {\textcopyright} 2018 SPIE.; Ground-based and Airborne Instrumentation for Astronomy VII 2018 ; Conference date: 10-06-2018 Through 14-06-2018",
year = "2018",
month = jan,
day = "1",
doi = "10.1117/12.2313460",
language = "English",
isbn = "9781510619579",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Luc Simard and Luc Simard and Evans, \{Christopher J.\} and Hideki Takami",
booktitle = "Ground-based and Airborne Instrumentation for Astronomy VII",
}