Drifts in the orientation parameters of the Pulkovo horizontal transit circle

Details Drifts in the orientation parameters of the Pulkovo horizontal transit circle Drifts in the orientation parameters of the Pulkovo horizontal transit circle

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pazh...10..143k&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 10, Feb. 1984, p. 143-148) Soviet Astronomy Letters (ISSN 0360-0327), vol. 10, Jan.-Feb

Astronomy and Astrophysics

Astronomy

Astronomy, Drift (Instrumentation), Instrument Orientation, Temperature Dependence, Temperature Measurement, Collimation, Temperature Gradients

Scientific paper

Autocollimation measurements during 1981-1983 indicate the temperature dependence of the Pulkovo horizontal transit circle tube inclinations 1.7 arcsec/(1 C), - 1.2 arcsec/(1 C) for the S, N tubes and graduated-circle zero point - 0.11 arcsec/(1 C). These effects are attributable to warping of the exposed HTC foundation. Thermostatic control of the foundation and the instrument, or replacement of the solid foundation by individual piers, would minimize the drifts in the instrument orientation parameters. Meanwhile frequent measurement of the HTC foundation temperature will permit effective adjustments during transit observations.

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