CCD astrometry of faint compact extragalactic radio sources. III.

Details CCD astrometry of faint compact extragalactic radio sources. III. CCD astrometry of faint compact extragalactic radio sources. III.

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...381...13c&link_type=abstract

Astronomy and Astrophysics, v.381, p.13-20 (2002)

Astronomy and Astrophysics

Astrophysics

3

Astrometry, Reference Systems

Scientific paper

Optical positions relative to the Hipparcos Catalogue (ESA 1997) have been obtained for the optical counterparts of 38 faint (B ~ 20-24) southern compact extragalactic radio sources (CERS). Many of these sources are not detectable - or their coordinates not adequately measurable - by means of direct photography with a wide-field telescope, so the positions were determined using a multi-step procedure involving CCD and photographic observations. This method responds both to the requirement of attaining small positional errors, and the need to refer the positions to a standard astrometric system. Estimated precisions as good as 50 mas were achieved. For 16 of the above objects we are proposing a completely new optical identification or providing a revised finder. A comparison of our optical positions with available VLBI radio positions is presented. The residuals obtained are in most cases consistent with the precision of our optical data, and provide an evaluation of these CERS as radio/optical frame link sources (or their identification as astrophysically interesting astrometric outliers). Twenty nine of the CERS observed are either defining or candidate fiducial objects of the present International Celestial Reference System (ICRS, Ma et al. 1998), so the optical data we have obtained for them is potentially useful to help mantain and possibly improve the current link of the Hipparcos reference frame to the ICRS. Figures 1-16 are only available in electronic form at http://www.edpsciences.org

Affiliated with

Also associated with

No associations

Rating

CCD astrometry of faint compact extragalactic radio sources. III. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with CCD astrometry of faint compact extragalactic radio sources. III., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CCD astrometry of faint compact extragalactic radio sources. III. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1085261