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Title:
Corrections to the FK5 reference frame from Sun's observations with the astrolabes at Abrahao de Moraes (1988-1994) and Calern (1988-1991) Observatories.
Authors:
Poppe, P. C. R.; Leister, N. V.; Laclare, F.
Publication:
Astronomy and Astrophysics, v.315, p.633-637 (A&A Homepage)
Publication Date:
11/1996
Origin:
CDS
Astronomy Keywords:
ASTROMETRY, REFERENCE SYSTEMS, EPHEMERIDES, SUN: GENERAL
Bibliographic Code:
1996A&A...315..633P

Abstract

In this paper we show the results of the astrometric observational program of the Sun accomplished with the modified Danjon astrolabe at the Abrahao de Moraes (OAM, φ=-23°00'06", λ=+03^h^07^m^52.2^s^ - Brazil) and Calern (OCA, φ=+43°44'55.888", λ=-00^h^27^m^42.442^s^ - France) Observatories. The combination of these observations allows to cover in full the apparent orbit of the Sun. The main purpose of this program is to determine the orientation of the new fundamental reference coordinate system as well as the corrections to the Earth's orbit parameters. The observations are reduced to the system FK5. The global solution obtained by least squares method reveals corrections -0.03"+/-0.01" and +0.10"+/-0.02" to the means values of the equator and equinox, respectively. It appears that the available new data do not reveal a significant correction to the FK5.

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