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Realization of a Single Image with Autocollimation for PHA I

Published online by Cambridge University Press:  07 August 2017

Xu Jiayan ,
Wang Hongqi  and
Zhang Zhiwu
Xu Jiayan
Affiliation:
Shaanxi Astronomical Obs., Academia Sinica P.O. Box 18, Lintong Xian, P.R. China
Wang Hongqi
Affiliation:
Shaanxi Astronomical Obs., Academia Sinica P.O. Box 18, Lintong Xian, P.R. China
Zhang Zhiwu
Affiliation:
Shaanxi Astronomical Obs., Academia Sinica P.O. Box 18, Lintong Xian, P.R. China

Abstract

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The First PHotoelectric Astrolabe (PHA I) of China was installed at Shaanxi Obs. in 1971 and came into use later. PHA I has been operating automatically since 1986. Now it is being revised by using a single image with autocollimation, equipped with photon counting system and a tracking diaphragm with a small window to follow the star in zenith direction, which would cut off the most light of the night sky. With all these three approaches, PHA I could improve its limiting magnitude from mag. 6 to mag. 11 or even fainter.

Type
Ground-Based Optical Astrometry
Information
Symposium - International Astronomical Union , Volume 156: Developments in Astrometry and their Impacts on Astrophysics , 1993 , pp. 89 - 93
Copyright
Copyright © Kluwer 

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