Construction of an inertial coordinate system using a CCD

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Coordinates, Inertial Coordinates, Position (Location), Reference Stars, Astronomical Photography, Charge Coupled Devices, Field Of View, Galaxies, Image Processing

Scientific paper

CCD measurements of the positions of galaxies relative to reference stars are used to construct an inertial coordinate system (ICS). The characteristics of the CCD employed are reviewed; the theoretical basis of the overlap exposure method is explained; and the formulas used in the determination of scales and the corrections for nonperpendicular axes and overlap exposure are given. Results obtained on the basis of observations with the 1-m telescope at Yunnan Observatory during 1986 are presented in tables and briefly discussed. The internal consistency of the ICS is found to be + or - 50 marcsec.

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