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Astrometric Calibration of the Gemini NICI Planet-Finding CampaignBased on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc. under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

Authors
  • Thomas L, Hayward
  • Beth A, Biller
  • Michael C, Liu
  • Eric Nielsen
  • Zahed, Wahhaj
  • Mark, Chun
  • Christ, Ftaclas
  • Markus, Hartung
  • Douglas W, Toomey
Type
Published Article
Journal
Publications of the Astronomical Society of the Pacific
Publisher
IOP Publishing
Publication Date
Dec 01, 2014
Volume
126
Issue
946
Pages
1112–1112
Source
SETI Institute
License
Unknown

Abstract

We describe the astrometric calibration of the Gemini NICI Planet-Finding Campaign. The Campaign requires a relative astrometric accuracy of≈ 20 mas across multiyear timescales in order to distinguish true companions from background stars by verifying common proper motion and parallax with their parent stars. The calibration consists of a correction for instrumental optical image distortion, plus on-sky imaging of astrometric fields to determine the pixel scale and image orientation. We achieve an accuracy of ...

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