Astrometric Calibration of the Gemini NICI Planet-Finding Campaign

Astrometric Calibration of the Gemini NICI Planet-Finding Campaign

We describe the astrometric calibration of the Gemini NICI Planet-Finding Campaign. The Campaign requires a relative astrometric accuracy of [asymptotically =]20 mas across multiyear timescales in order to distinguish true companions from background stars by verifying common proper motion and parall...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 2014-12, Vol.126 (946), p.1112-1125
Hauptverfasser: Hayward, Thomas L, Biller, Beth A, Liu, Michael C, Nielsen, Eric L, Wahhaj, Zahed, Chun, Mark, Ftaclas, Christ, Hartung, Markus, Toomey, Douglas W
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Sprache:eng
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Zusammenfassung:We describe the astrometric calibration of the Gemini NICI Planet-Finding Campaign. The Campaign requires a relative astrometric accuracy of [asymptotically =]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 [
ISSN:0004-6280
1538-3873
DOI:10.1086/679508