Precision astrometry with SuperCOSMOS

Details Precision astrometry with SuperCOSMOS Precision astrometry with SuperCOSMOS

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.298..897h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 298, Issue 3, pp. 897-904.

Astronomy and Astrophysics

Astronomy

29

Methods: Data Analysis, Astrometry

Scientific paper

We describe the new, fast, high-precision microdensitometer SuperCOSMOS. Some aspects of hardware and software design that enable high-precision astrometry from photographic plates are explained. We show that the positioning repeatability of the measuring machine is less than 0.1μμm standard error in either coordinate, and the absolute positional accuracy is about 0.15μm standard error. Furthermore, measurements of the same plate in different orientations show that the sampling errors are small (e.g. ~0.2μm, rising to ~1.0μm at the plate limit, for stellar images in a IIIaJ emulsion), thus allowing the extraction of relative positional information from Schmidt plates at accuracies less than 1μm. We demonstrate that SuperCOSMOS is capable of measuring the positions of bright stars (i.e. those more than ~4 mag above the plate limit) to a precision ~0.5μm with survey-grade photographic plates employing fine-grained emulsions.

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