Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasp..114...98b&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 114, Issue 791, pp. 98-111.
Astronomy and Astrophysics
Astronomy
9
Methods: Data Analysis, Space Vehicles: Instruments
Scientific paper
The familiar tools of Fourier analysis and Fisher matrices are applied to derive the uncertainties on photometric, astrometric, and weak-lensing measurements of stars and galaxies in real astronomical images. Many effects or functions that are ignored in basic exposure-time calculators can be included in this framework: pixels of size comparable to the stellar image, undersampled and dithered exposures, cosmic-ray hits, intrapixel sensitivity variations, and positional and ellipticity errors, as well as photometric errors. I present a formalism and a C++ implementation of these methods. As examples of their use, I answer some commonly arising questions about imaging strategies: What amount of dithering is ideal? What pixel size optimizes the productivity of a camera? Which is more efficient-space-based or ground-based observing?
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