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Effects of ICRF2 on the TRF, CRF, and EOP

  • David GordonEmail author
  • Chopo Ma
  • Dan MacMillan
  • Sergei Bolotin
  • Karine Le Bail
  • John Gipson
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 138)

Abstract

The ICRF2 became official on Jan 1, 2010. It includes positions of 3414 compact radio astronomical sources observed with VLBI, a fivefold increase over the first ICRF. ICRF2 was aligned with the ICRS using 138 stable sources common to both ICRF2 and ICRF-Ext2. Maintenance of ICRF2 is to be made using 295 defining sources chosen for their historical positional stability, minimal source structure, and sky distribution. The switchover to ICRF2 has had some small effects on the terrestrial reference frame (TRF), celestial reference frame (CRF) and Earth orientation parameter (EOP) solutions from VLBI. A CRF based on ICRF2 shows a relative rotation of ~40μas with respect to ICRF, mostly about the Y-axis. Small shifts are also seen in the EOP, the largest being ~11μas in Xpole. Some small but insignificant differences are also seen in the TRF.

Keywords

ICRF ICRF2 Terrestrial reference frames Celestial reference frames Earth orientation parameters 

Notes

Acknowledgements

We would like to thank the International VLBI Service for Geodesy and Astrometry (IVS) and all its components, which have made the ICRF2 and this study possible. We would also like to thank the National Radio Astronomy Observatory and the VLBA for observing time and support which greatly improved the quality and the quantity of the data used in the ICRF2 and in this study. NRAO is an NSF facility operated under cooperative agreement by Associated Universities, Inc.

References

  1. Fey AL, Charlot P (1997) VLBA observations of radio reference frame sources. II. Astrometric suitability based on observed structure. Astrophys J Suppl 111:95–142CrossRefGoogle Scholar
  2. Fey AL, Ma C, Arias EF, Charlot P, Feissel-Vernier M, Gontier A-M, Jacobs CS, Li J, MacMillan DS (2004) The second extension of the international celestial reference frame: ICRF-EXT 1. Astron J 127:3587–3608CrossRefGoogle Scholar
  3. Fricke W, Schwan H, Lederle T, Bastian U, Bien R, Burkhardt G, Mont BD, Hering R, Jährling R, Jahreiß H, Röser S, Schwerdtfeger H-M, Walter HG (1988) Fifth fundamental catalogue (FK5). Part I: the basic fundamental stars, vol 32. Veröff. Astron. Rechen-Institut, Heidelberg, pp 1–106Google Scholar
  4. IERS (1999) 1998 international Earth rotation service annual report. Observatoire de Paris, ParisGoogle Scholar
  5. IERS (2009) IERS technical note 35, The second realization of the international celestial reference frame by very long baseline interferometry. In: Fey AL, Gordon D, Jacobs CS (eds) Verlag des Bundesamts für Kartographie und Geodäsie, Frankfurt am Main. (http://www.iers.org/TN35)
  6. Ma C, Arias EF, Eubanks TM, Fey AL, GontierA-M, Jacobs CS, Sovers OJ, Archinal BA, Charlot P (1997) The international celestial reference frame realized by VLBI. In: Ma C, Feissel M (eds) IERS technical note 23, Definition and realization of the international celestial reference system by VLBI astrometry of extragalactic objects, Observatoire de Paris, Paris (http://www.iers.org/TN23)
  7. Ma C, Arias EF, Eubanks TM, Fey AL, Gontier A-M, Jacobs CS, Sovers OJ, Archinal BA, Charlot P (1998) The international celestial reference frame as realized by very long baseline interferometry. Astron J 116:516–546CrossRefGoogle Scholar
  8. Petrov L, Kovalev YY, Fomalont EB, Gordon D (2008) The sixth VLBA calibrator survey: VCS6. Astron J 136:580–585CrossRefGoogle Scholar
  9. Sokolova J, Malkin Z (2007) On comparison and combination of radio source positions. AA 474:665–670CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • David Gordon
    • 1
    Email author
  • Chopo Ma
    • 2
  • Dan MacMillan
    • 1
  • Sergei Bolotin
    • 1
  • Karine Le Bail
    • 1
  • John Gipson
    • 1
  1. 1.NVI Inc. and NASA/GSFCGreenbeltUSA
  2. 2.NASA/GSFCGreenbeltUSA

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