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Optical Reference Frame Defined by Carlsberg Meridian Catalogue La Palma Number 4

  • LV Morrison (a1), RW Argyle (a1), L Helmer (a2), C Fabricius (a2), OH Einicke (a2), L Quijano (a3) and JL Muiños (a3)...

Abstract

The contribution of the Carlsberg Meridian Catalogue La Palma Number 4 to the determination of the optical reference frame is discussed. This catalogue of almost 51000 stars provides one of the most accurate optical reference frames at the present epoch, having a density of 1 star per square degree, and an average accuracy of 0.″12 in position and 0.″003 per year in proper motion for stars with V<9. The catalogue also contains positions of reference stars with V>11 in the fields of benchmark extragalactic radio sources which can be used in linking the optical reference frame defined by the FK5 to the extragalactic frame.

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References

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Fabricius, C., Helmer, L., Einicke, O.H., Morrison, L.V., Buontempo, M.E., Argyle, R.W., Quijano, L. and Muiños, J.L. (1990) ‘First results from the new micrometer on the Carlsberg Automatic Meridian Circle’, these proceedings.
Helmer, L., Fabricius, C., Einicke, O.H., Thoburn, C. and Morrison, L.V. (1984) 'Meridian observations made with the Carlsberg Automatic Meridian Circle at Brorfelde (Copenhagen University Observatory) 1982-1983, Astron. Astrophys. Suppl. Ser. , 55, 87102.
Helmer, L. and Morrison, L.V. (1985) ‘Carlsberg Automatic Meridian Circle’, Vistas in Astronomy , 28, 505518.
Høg, E. and Fabricius, C. (1988) ‘Atmospheric and internal refraction in meridian observations’, Astron. Astrophys. , 196, 301312.
Morrison, L.V., Gibbs, P., Helmer, L., Fabricius, C., Einicke, O.H., Requième, Y. and Rapaport, M. (1990), ‘Evidence of systematic errors in FK5’, in IAU Coll. No. 100 ‘Fundamentals of Astrometry’ [Ed. Eichhorn], Belgrade, 1987. Kluwer Acad. Publ., Dordrecht.
Morrison, L.V., Argyle, R.W., Requième, Y. and Mazurier, J.M. (1990) ‘Comparison of optical and radio positions of stars’, submitted to Astron. Astrophys.

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