In:
Symposium - International Astronomical Union, Cambridge University Press (CUP), Vol. 156 ( 1993), p. 89-93
Abstract:
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 of Medium:
Online Resource
ISSN:
0074-1809
DOI:
10.1017/S0074180900172997
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
1993
SSG:
16,12
