Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26as...43..247l&link_type=abstract
Astronomy and Astrophysics Supplement, Vol. 43, P. 247, 1981
Astronomy and Astrophysics
Astrophysics
Scientific paper
This paper reports the experimental results of stability measurements of pillars bearing astronomical instruments at CERGA observatory.
These inclination deviation measurements have been carried out by means of horizontal pendulums like those used elsewhere for determination of Earth tide horizontal components. These instruments allow to obtain a considerable amplification of very low variations of inclination of the support where they have been situated. The measures obtained at different points of the observatory reveal a diurnal inclination variation up to 1 ' probably of thermal origin, and variations up to 10" that could be linked to hydro-geologic effects. A study on long periods will allow us to decide if movements exist affecting the whole site of the observatory. The results show the weight to be ascribed to different stability factors i.e. form and pillars implantation, nature of the socle and the material. At last we must underline the interest of such measures in case of astrometric applications of interferometric techniques and in case of very exact guiding of an altazimutal instrument.
Cormier P.
Laclare Francis
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