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Celestial Reference Frames at Multiple Radio WavelengthsIn 1997 the IAU adopted the International Celestial Reference Frame (ICRF) built from S/X VLBI data. In response to IAU resolutions encouraging the extension of the ICRF to additional frequency bands, VLBI frames have been made at 24, 32, and 43 gigahertz. Meanwhile, the 8.4 gigahertz work has been greatly improved with the 2009 release of the ICRF-2. This paper discusses the motivations for extending the ICRF to these higher radio bands. Results to date will be summarized including evidence that the high frequency frames are rapidly approaching the accuracy of the 8.4 gigahertz ICRF-2. We discuss current limiting errors and prospects for the future accuracy of radio reference frames. We note that comparison of multiple radio frames is characterizing the frequency dependent systematic noise floor from extended source morphology and core shift. Finally, given Gaia's potential for high accuracy optical astrometry, we have simulated the precision of a radio-optical frame tie to be approximately10-15 microarcseconds ((1-sigma) (1-standard deviation), per component).
Document ID
Document Type
Conference Paper
External Source(s)
Jacobs, Christopher S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 21, 2015
Publication Date
August 20, 2012
Publication Information
Publication: Highlights of Astronomy
Volume: 15
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Earth Resources And Remote Sensing
Meeting Information
Meeting: IAU General Assembly
Location: Beijing
Country: China
Start Date: August 20, 2012
End Date: August 24, 2012
Sponsors: National Astronomical Observatory, International Astronomy Union, Associated Universities, Inc., International Centre for Radio Astronomy Research (ICRAR)
Distribution Limits
reference systems
high angular resolution
radio continuum

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