Astrometry with a PDS microdensitometer using cubic splines

Details Astrometry with a PDS microdensitometer using cubic splines Astrometry with a PDS microdensitometer using cubic splines

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..656p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 2, Jan. 1991, p. 656-662.

Astronomy and Astrophysics

Astrophysics

3

Astrometry, Cubic Equations, Digital Techniques, Microdensitometers, Spline Functions, Astronomical Photometry, Faint Objects, Open Clusters

Scientific paper

For digital image centering, the cubic spline technique has been applied to marginal distributions of PDS measured density arrays. This centering algorithm provides accuracies similar to that of a symmetric Gaussian. For faint stars, spline fitting is more accurate and stable than the Gaussian one. Spline fitting is also recommended for nonstellar object (comets, galaxies, etc.) astrometry. The optimal use of a PDS microdensitometer is discussed as well.

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