Using image area to control CCD systematic errors in spaceborne photometric and astrometric time-series measurements

Details Using image area to control CCD systematic errors in spaceborne photometric and astrometric time-series measurements Using image area to control CCD systematic errors in spaceborne photometric and astrometric time-series measurements

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..685b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, July 1991, p. 685-693.

Astronomy and Astrophysics

Astronomy

15

Astrometry, Astronomical Photometry, Charge Coupled Devices, Error Analysis, Spaceborne Astronomy, Time Series Analysis, Image Analysis, Telescopes

Scientific paper

The effect of some systematic errors for high-precision time-series spaceborne photometry and astrometry has been investigated with a CCD as the detector. The 'pixelization' of the images causes systematic error in astrometric measurements. It is shown that this pixelization noise scales as image radius r exp -3/2. Subpixel response gradients, not correctable by the 'flat field', and in conjunction with telescope pointing jitter, introduce further photometric and astrometric errors. Subpixel gradients are modeled using observed properties of real flat fields. These errors can be controlled by having an image span enough pixels. Large images are also favored by CCD dynamic range considerations. However, magnified stellar images can overlap, thus introducing another source of systematic error. An optimum image size is therefore a compromise between these competing factors.

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