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Interaction Between the Celestial and the Terrestrial Reference FramesEffects of International Celestial Reference Frame (ICRF2) on the Terrestrial Reference Frames (TRF), CRF and EOP's, The ICRF2 became official on Jan. 1, 2010. It includes positions of 3414 compact radio astronomical sources observed with VLBI, a fivefold increase from the first ICRF. Numerous new VLBI models were used and the most unstable sources were treated as arc parameters to avoid distortions of the frame. The ICRF2 has a noise floor of 40 micro-arc-seconds and an axis stability of 10 micro-arc-seconds. It was aligned with the ICRS using 138 stable sources common to 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. Their stability and their more uniform sky distribution eliminate the two largest weaknesses of ICRF I. The switchover to ICRF2 has some small effects on the TRF, CRF and Earth Orientation Parameters (EOP). A CRF based on ICRF2 shows a relative rotation of 40 micro-arc-seconds, mostly about the Y-axis. Small shifts are also seen in the EOP's, the largest being 11 micro-arc-seconds in X-pole. Some small but insignificant differences are also seen in the TRF. These results will be presented and discussed.
Document ID
20100031156
Document Type
Conference Proceedings
Authors
Gordon, David
(NVI, Inc. Greenbelt, MD, United States)
MacMillan, Dan
(NVI, Inc. Greenbelt, MD, United States)
Bolotin, Sergei
(NVI, Inc. Greenbelt, MD, United States)
Le Bail, Karine
(NVI, Inc. Greenbelt, MD, United States)
Gipson, John
(NVI, Inc. Greenbelt, MD, United States)
Ma, Chopo
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2010
Subject Category
Astronomy
Meeting Information
Meeting: IAG Commission I Symposium 2010
Location: Marne la Vallee
Country: France
Start Date: October 4, 2010
End Date: October 8, 2010
Sponsors: International Association of Geodesy, Institut Geographique National
Distribution Limits
Public
Copyright
Other

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