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Astrometric distortion calibration of a portable refractor

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Abstract

A compact refractor simplifies imaging stars during a total solar eclipse from remote, temporary locations. To achieve astrometric accuracy, cubic distortion terms were measured using hundreds of nighttime images. A detailed procedure is presented here, along with an example from a portable telescope. The results show that precisions down to the 20 mas level are possible with commercial equipment.

© 2017 Optical Society of America

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