CTIO 0.9m Observations of ICRF Optical Counterparts

Abstract

We present astrometric results from 7 observing runs at the Cerro Tololo Interamerican Observatory (CTIO) 0.9m telescope of 197 extragalactic reference frame sources, selected from the original International Celestial Reference Frame (ICRF) catalog. This is part of the U.S. Naval Observatory (USNO) reference frame link program. Contemporaneous to the CTIO deep imaging, wide-field CCD data were taken with the USNO Twin Astrogragh to provide accurate secondary reference stars in the 13 to 16 mag range. The optical positions are on the Hipparcos system (via Tycho-2 stars). The unweighted, mean RMS position difference optical-radio for a single source is 28 and 25 mas for RA and Dec, respectively.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2007
Accession Number
ADA477733

Entities

People

  • Marion I. Zacharias
  • Norbert Zacharias

Organizations

  • United States Naval Observatory

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Agreements
  • Assembly
  • Astronomy
  • Availability
  • Buildings And Structures
  • Calibration
  • Classification
  • Contracts
  • Demographic Cohorts
  • Distortion
  • Histograms
  • Information Operations
  • Observation
  • Observatories
  • Residuals
  • Telescopes

Fields of Study

  • Physics

Readers

  • Astronomy/Astrophysics

Technology Areas

  • Space