Astrometry of 25 Southern Hemisphere Radio Sources From A VLBI Short-Baseline Survey

Abstract

Milliarcsecond-accurate radio positions for 25 southern hemisphere extragalactic sources are reported. These positions are derived from Mark III Very Long Baseline Interferometry observations made between 2003 September and 2004 May on the intra-Australia baseline connecting Hobart, Tasmania and Parkes, New South Wales. The results presented here represent an ongoing program intended to increase the number of phase reference sources with accurate positions in the southern hemisphere for use in astrophysical observations. The positions for all but 1 of the 25 sources are south of delta=-45 degree and have average formal uncertainties of 3 mas in alpha cos delta and 2 mas in delta. As the reported positions are in the frame of the International Celestial Reference Frame (ICRF) , the results reported here can also be used to increase the sky density of southern hemisphere ICRFastrometry catalogs quasars: general radio continuum: galaxies reference systems techniques: interferometric

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2004
Accession Number
ADA428926

Entities

People

  • Alan L. Fey
  • John E. Reynolds
  • Peter M. Mcculloch
  • Roopesh Ojha
  • Simon P. Ellingsten

Organizations

  • United States Naval Observatory

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Abstracts
  • Accuracy
  • Australia
  • Base Lines
  • Calibration
  • Data Analysis
  • Data Sets
  • Flux Density
  • Frequency
  • Jet Propulsion
  • Measurement
  • Observatories
  • South Africa
  • Southern Hemisphere
  • Telescopes
  • Uncertainty
  • United States

Fields of Study

  • Physics

Readers

  • Astronomy/Astrophysics
  • Geodesy

Technology Areas

  • Space