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The Celestial Reference Frame at X/Ka-band (8.4/32 GHz)

  • C. S. JacobsEmail author
  • J. E. Clark
  • C. García-Miró
  • M. B. Heflin
  • S. Horiuchi
  • V. E. Moll
  • L. J. Skjerve
  • O. J. Sovers
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 138)

Abstract

A celestial reference frame at X/Ka-band (8.4/32GHz) has been constructed using fifty-one 24-h sessions with the Deep Space Network. We report on observations which have detected 436 sources covering the full 24 h of right ascension and declinations down to −45°. Comparison of this X/Ka-band frame to the S/X-band (2.3/8.4 GHz) ICRF2 shows wRMS agreement of 200 micro-arcsec (μas) in \( \alpha cos\delta \) and 290 μas in δ. There is evidence for zonal errors at the 100 μas level. Known errors include limited SNR, lack of phase calibration, troposphere mismodelling, and limited southern geometry. The motivations for extending the ICRF to frequencies above 8 GHz are to access more compact source morphology for improved frame stability, to provide calibrators for phase referencing, and to support spacecraft navigation at Ka-band.

Keywords

Reference systems Catalogs Astrometry Celestial reference frame ICRF Interferometry VLBI Radio continuum Ka-band Galaxies: active galactic nuclei Quasars Blazars 

Notes

Acknowledgements

We are thankful for thorough reviews of this paper by Bill Petrachenko and an anonymous referee who corrected several errors and improved the clarity of the presentation. Any remaining deficiencies are solely the responsibility of the authors. The research described herein was performed at the Jet Propulsion Laboratory of the California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Government sponsorship acknowledged. Copyright ©2011. All rights reserved.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • C. S. Jacobs
    • 1
    Email author
  • J. E. Clark
    • 1
  • C. García-Miró
    • 2
  • M. B. Heflin
    • 1
  • S. Horiuchi
    • 3
  • V. E. Moll
    • 2
  • L. J. Skjerve
    • 1
  • O. J. Sovers
    • 1
  1. 1.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA
  2. 2.Ingenieria y Servicios Aeroespaciales, Instituto Nacional de Técnica Aeroespacial/NASAMadridSpain
  3. 3.C.S.I.R.O. Astronomy and Space Science/NASATuggeranong ACTAustralia

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