An astrometric test of the Shanghai 1.5 m R-C reflector

Details An astrometric test of the Shanghai 1.5 m R-C reflector An astrometric test of the Shanghai 1.5 m R-C reflector

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991cha%26a..15...56m&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 15, Issue 1, p. 56-64.

Astronomy and Astrophysics

Astrophysics

1

Astromerty-Telescope

Scientific paper

We have carried out an astrometric test of the 1.56m reflector of Shanghai Observatory. Two plates of the Pleiades region were taken and the images were measured with a PDS microdensitometer. Referring to the positions given in Eichhorn's catalogue as, standards and using a cubic reduction formula, we find the positions within +/-14' of the centre are determined with an accurcy of 0.03'', and within +/-16', an accuracy of 0.04''. A comparison with the Mexican 2.12m reflector is made. In addition, the coefficient of the coma term in the plate constants is found to be on the order of 10-4-10-5 and that of the distortion term, on the order of 10-8-10-9. These figures indicate that the 1.56 R-C Reflector is well fitted to undertake astrometry of faint objects.

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