Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87....1d&link_type=abstract
Astronomy and Astrophysics, vol. 87, no. 1-2, July 1980, p. 1-5.
Astronomy and Astrophysics
Astrophysics
Astrometry, Astronomical Observatories, Instrument Errors, Instrument Orientation, Measuring Instruments, Pivots, Automation, Azimuth, Digital Techniques, Irregularities, Transducers
Scientific paper
After a brief review of the methods used so far in studying the shape of pivots in meridian instruments, a system of measurements based on a chain of fully automated instruments is described. It involves the use of a micrometric transducer, able to record 1/100 micron with a twin-channel graph-recorder and a digital voltmeter printer. A graph of the pivot shape and a digital output measuring the movement of the transducer stylus are obtained. After showing the advantages offered by this system and the problems which its use can solve, the theoretical background of the method is discussed and expressions for the true shape of the pivots and the consequent corrections to be made to astronomical observations are given. Finally, some results of pivot measurements on the Large Transit Instrument of the International Astronomical Station of Latitude at Cagliari are given.
de Concini C.
Zanzu T.
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