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Internal Precision in CCD Astrometry of QSO Optical Counterparts

  • G. Chiumiento (a1), L. Lanteri (a1), M.G. Lattanzio (a1) (a2) and G. Massone (a1)

Abstract

The main purpose of this contribution is twofold. First, we report on a preliminary assessment of the astrometric properties of the CCD system we are presently using to extend the magnitude limit of the Torino program on optical positions of QSO’s. This assessment is based on the internal consistency of the positions derived from different CCD frames of the same objects. Then, we give a first evaluation of the precision of CCD derived QSO positions after extending a plate based reference frame (secondary frame) onto the CCD images (tertiary frame).

Special emphasis is given to comparisons with plate positions of the same faint objects. It is shown that use of the CCD camera promises a factor of five (or larger) improvement in the precision of QSO positions.

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Copyright

References

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Argue, A.N., De Vegt, C., Elsmore, B. et al.: 1984, Astron.Astrophys., 130, 191.
Carlsberg Meridian Catalogue No. 4, La Palma 1989. Eds. Copenhagen Univ. Observatory, Royal Greenwich Observatory, Instituto y Obs. de San Fernando.
Chiumiento, G., Lattanzi, M.G., Massone, G., Morbidelli, R., Pannunzio, R., Sarasso, M.: in “Fundamentals of Astrometry”, IAU Coll. No. 100, Belgrade 1987, Ed. Eichhorn, H.K., Astrophys. Space Science, in press.
Chiumiento, G., Lattanzi, M.G., Massone, G., Morbidelli, R., Pannunzio, R., Sarasso, M.: 1990, Inertial Coordinate Systems on the Sky, Leningrad 1989, 501502, Eds. Lieske, J.H. and Abalakin, V.K., Kluwer Acad. Publ., Dordrecht.
Lanteri, L.: 1990, Osserv. Astron. di Torino, Internal Report no. 16.

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