Test and analysis of the sway for the DCMT horizontal axis.

Details Test and analysis of the sway for the DCMT horizontal axis. Test and analysis of the sway for the DCMT horizontal axis.

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pshao..14...37f&link_type=abstract

Publ. Shaanxi Astron. Obs., Vol. 14, No. 1, p. 37 - 43

Astronomy and Astrophysics

Astronomy

Scientific paper

The sway of the horizontal axis for the DCMT has been analyzed and studied. The direction of the horizontal axis of the DCMT's is determined by the basic plane of the end of the big gear. The deviation from a ideal plane for the basic plane causes the sway of the horizontal axis. There are two kinds of effects of the sway on instrument precision: (1) causing sway of main mirror, (2) causing displacement of coordinate system of the micrometer. Since there exists an automatic collimation system of the DCMT, the observation accuracy is mainly influenced by the repeatability of the horizontal axis, so that the repeatability of the sway for the horizontal axis is discussed in this paper. The test and estimation show that the accuracy of repeatability of sway is about 0″18 for the horizontal axis of the DCMT.

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