Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2101j&link_type=abstract
American Astronomical Society Meeting 210, #21.01; Bulletin of the American Astronomical Society, Vol. 39, p.123
Astronomy and Astrophysics
Astronomy
Scientific paper
A celestial reference frame at Ka/ X-band (32/8 GHz) has been constructed using twenty five 24-hour sessions on the Deep Space Network. We report on observations which have detected 311 sources covering the full 24 hours of right ascension and declinations down to -45 deg. Comparison of this Ka/ X-band frame to an S/X-band (2.3/8 GHz) ICRF-like frame shows agreement of 300 micro-arcsec in RA cos(dec) and 420 micro-arcsec in declination. The motivations for extending the ICRF to frequencies above 8 GHz are to use more compact sources less susceptible to structure changes in order to construct a more stable frame, to provide calibrators for phase referencing, and to support spacecraft navigation at higher frequencies.
Acknowledgement: The research described in this paper was performed at the Jet Propulsion Laboratory of the California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
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