A radio optical reference frame. I - Precise radio source positions determined by Mark III VLBI - Observations from 1979 to 1988 and a tie to the FK5

Ma, C.; Shaffer, D. B.; Vegt, C. de; Johnston, K. J.; Russell, J. L.

doi:10.1086/115417

Cited by 54 publications

(27 citation statements)

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“…They may be ascribed to specific nutation models applied to the reduction of the original measurements, confirming the occurence of relative rotations between coordinate systems (Ma et al, 1990).…”

Section: Discussionmentioning

confidence: 53%

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Analysis and Synthesis of Catalogues of Extragalactic Radio Sources

Walter

1991

International Astronomical Union Colloquium

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ABSTRACT. Recent observation catalogues of extragalactic radio sources obtained by Very Long Baseline Interferometry agree in the mean to a few milliarcseconds (mas). Within this range the position differences show constant, linear and periodic offsets. To cast light on these offsets the differences between some of the representative observation catalogues are plotted. Especially, the periodic variations of declination differences of observation catalogues having significantly different epochs are tentatively explained by an uncertainty of the general precession in declination. In terms of the luni-solar precession this uncertainty is estimated to be of the order of -1 to -2 mas per year.

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Section: Discussionmentioning

confidence: 53%

“…Only a few plots of AS vs RA are displayed here for discussing some marked features. •) outliers Fanselow et al, 1984Ma et al, 1986Sovers et al, 1988Ma, 1988Sovers, 1989Ma et al, 1990 which is equivalent to the correction A\|i = -1.9 mas/yr of the lunisolar precession i|>. …”

Section: Introductionmentioning

confidence: 99%

Analysis and Synthesis of Catalogues of Extragalactic Radio Sources

Walter

1991

International Astronomical Union Colloquium

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“…The program proposed to use all Mark III data available in a consistent solution , and resulted in a number of catalogs between 1991 and 1995. The first was a catalog of 182 sources with a positional accuracy of one mas (Ma et al 1990). The right ascension zero point was defined by the FK5 based optical positions of 28 quasars.…”

Section: The Radio Reference Framementioning

confidence: 99%

Reference Frames in Astronomy

Johnston¹,

Vegt²

1999

Annu. Rev. Astron. Astrophys.

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Key Words astrometry, reference frames, reference systems s Abstract Advances in wide-angle astrometric measurements of three to four orders of magnitude in the last thirty years have resulted in a redefinition of the fundamental astronomical reference frame. This new frame, the International Celestial Reference Frame (ICRF), is based on the radio positions of 212 compact extragalactic radio sources. The ICRF defines the direction of the axes of the International Celestial Reference System (ICRS) with a precision of approximately 20 µas. At optical wavelengths, the Hipparcos catalog is the realization of this frame. The precision with which the ICRF is now determined requires that the ICRS models for precession, nutation, and others, be revised. Increases in the precision of measurements from astrometric space missions will further improve the celestial reference frame and may require its redefinition within the next ten years. These improvements will again challenge the models for the celestial reference system.

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“…These are based on the VLBI observing programs of the Goddard Space Flight Center (Crustal Dynamics Project (CDP), Ma et al, 1990), the Jet Propulsion Laboratory Deep Space Network (DSN) (Sovers et al, 1988), the National Geodetic Survey (International Radio Interferometric Surveying (IRIS), Robertson et al, 1986), and the U.S. Naval Observatory (USNO, Eubanks et al, 1990).…”

Section: Comparisons Of Source Catalogsmentioning

confidence: 99%

Consistency of Nutation Modeling in Radio Source Position Comparisons

Sovers

1991

International Astronomical Union Colloquium

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ABSTRACT. Comparisons between sets of radio source coordinates determined from independent VLBI measurements show that rotational offsets can be as large as several milliarcseconds (mas), and are considerably larger than the positional uncertainties (<1 mas). The 1 to 2 mas discrepancies remaining after removal of the rotational offsets indicate the present true level of accuracy. Analyses of DSN and CDP astrometric data are performed to explore the effects of alternative schemes of nutation modeling on such catalog comparisons. It is concluded that rotations between different source catalogs are minimized or eliminated if the nutation models employed are consistent. Intrinsic source coordinate discrepancies, however, remain at the 1 mas level.

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A radio optical reference frame. I - Precise radio source positions determined by Mark III VLBI - Observations from 1979 to 1988 and a tie to the FK5

Cited by 54 publications

References 0 publications

Analysis and Synthesis of Catalogues of Extragalactic Radio Sources

Analysis and Synthesis of Catalogues of Extragalactic Radio Sources

Reference Frames in Astronomy

Consistency of Nutation Modeling in Radio Source Position Comparisons

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