PLATAIS, I.; DJORGOVSKI, S. G.; DUCOURANT, C.; FEY, A. L.; FREY, S.; IVEZIC, Z.; MIGHELL, K. J.; REST, A.; WYSE, R. F. G.; ZACHARIAS, N.

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PLATAIS, I.
Yale University [New Haven]

DUCOURANT, C.
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]

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26th meeting of the IAU, Joint Discussion 16, 22-23 August 2006, Prague, Czech Republic, JD16, #38, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 2006, Prague, Czech Republic, JD16, #38, Nomenclature, Precession and New Models in Fundamental Astronomy, 2006-08-22, Prague. 2006-08, vol. 16, p. 38

Résumé en anglais

The advent of next generation imaging telescopes such as LSST and Pan-STARRS - instruments with wide fields and huge Giga-pixel cameras - will soon create a critical need for deep and precise reference frames for astrometric calibrations. The Deep Astrometric Standards (DAS) program aims to establish such a frame by providing astrometry at the 5-10 mas accuracy level in four 10 sq. deg Galactic fields, to a depth of V=25. We use 3-4 m class optical telescopes to set up these standards. The principal source of our reference frame is UCAC2 and VLBI positions of radio-loud QSOs having optical counterparts with V<25. The novelty of the DAS project is a new way of linking our observations to the ICRF. We pre-select the candidate radio-optical link sources from existing radio surveys, then conduct the VLA observations to measure the spectra and spatial compactness and, finally, observe the best 10-15 sources with the VLBI. So far, two out of the four DAS fields are in the advanced stages of construction.< Réduire

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Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804