Extension of ICRF for selected areas down to V=15 (Camargo+ 2001)

Details Extension of ICRF for selected areas down to V=15 (Camargo+ 2001) Extension of ICRF for selected areas down to V=15 (Camargo+ 2001)

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ycat..33750308c&link_type=abstract

VizieR On-line Data Catalog: J/A+A/375/308. Originally published in: 2001A&A...375..308C

Astronomy and Astrophysics

Astronomy

Positional Data, Proper Motions

Scientific paper

A catalogue of accurate positions and proper motions for 41,721 objects is provided. Objects are within areas of special astronomical interest, containing extragalactic radio sources, mostly from ICRF (see Cat. I/251), and pre-main-sequence (PMS) stars in Southern star-forming regions (Chamaeleon, Lupus and Upper Scorpius-Ophiuchus).
Positions and proper motions were derived by combining current epoch positions, obtained with the Valinhos CCD meridian circle (VMC, see 1999A&AS..134..173V), with first epoch catalogues, AC2000 (I/247) and USNO-A2.0 (I/252) mainly, as well as positions from plate measurements performed with the MAMA measuring machine (Guibert J., Charvin P. & Stoclet P., 1983, in Proceedings of the 78th Colloquium of the IAU), in Paris. On average, objects with V<=14.0 have positional precisions better than 50mas in both coordinates, and 100mas near the detection limit of the VMC (V~16,0). For proper motions, average precisions are better than 4mas/year, whatever the magnitude, when delta>=-17°. To the south of this declination, a magnitude dependence is verified due to a particular feature of the USNO-A2.0's epochs, providing figures of 3mas/year when V<=12.0, where the participation of AC2000 is noted, and reaching 17mas/year at the detection limit.
The catalogue data is grouped by area, following the same order and identification as given in table 2 of the paper; within each area, objects are sorted by right ascension. The respective record numbers for the beginning of each area are provided in a separate table.
(2 data files).

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