Precise near-IR astrometry and photometry of southern ICRF quasars

Details Precise near-IR astrometry and photometry of southern ICRF quasars Precise near-IR astrometry and photometry of southern ICRF quasars

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet...35c&link_type=abstract

In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs

Astronomy and Astrophysics

Astronomy

1

Reference Frames, Quasars

Scientific paper

We present high quality astrometry along with photometry for 30 southern ICRF quasars observed with the ESO NTT/SOFI at La Silla, in the J, H and Ks bands. While the internal precision for the positions of these quasars is generally better than 10 mas, our best positional accuracy, as given by a set of 14 quasars observed in an enlarged field of view, is 25 mas. Corrections for the field distortion of the camera have been applied to all images. The precision in magnitude determination is generally better than 0.04 mag. One of the objectives of this project is to provide initial candidates to the optical extension of the ICRF.

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