CCD Centroiding Experiment for Correcting a Distorted Image on the Focal Plane

Details CCD Centroiding Experiment for Correcting a Distorted Image on the Focal Plane CCD Centroiding Experiment for Correcting a Distorted Image on the Focal Plane

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pasp..118.1448y&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 118, Issue 848, pp. 1448-1454.

Astronomy and Astrophysics

Astronomy

5

Astrometry, Space Vehicles: Instruments, Techniques: High Angular Resolution, Methods: Data Analysis, Methods: Laboratory, Methods: Statistical

Scientific paper

JASMINE (Japan Astrometry Satellite Mission for Infrared Exploration) and ILOM (In situ Lunar Orientation Measurement) are space missions that are in progress at the National Astronomical Observatory of Japan. These two projects require a common astrometric technique to obtain precise positions of star images on solid-state detectors in order to accomplish their objectives. In the laboratory, we have carried out measurements of the centroid of artificial star images on a CCD array in order to investigate the precision of the positions of the stars, using an algorithm for estimating them from photon-weighted means of the stars. In the calibration of the position of a star image at the focal plane, we have also taken into account the lowest order distortion due to optical aberrations, which is proportional to the cube of the distance from the optical axis. Accordingly, we find that the precision of the measurement for the positions of the stars reaches below 1/100 pixel for one measurement.

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