Corrections to the luni-solar precession derived from a compilation catalogue of extragalactic radio sources

Details Corrections to the luni-solar precession derived from a compilation catalogue of extragalactic radio sources Corrections to the luni-solar precession derived from a compilation catalogue of extragalactic radio sources

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992cemda..53...71w&link_type=abstract

Celestial Mechanics and Dynamical Astronomy (ISSN 0923-2958), vol. 53, no. 1, 1992, p. 71-80.

Astronomy and Astrophysics

Astronomy

1

Astrometry, Astronomical Catalogs, Extragalactic Radio Sources, Precession, Root-Mean-Square Errors, Very Long Base Interferometry

Scientific paper

Observation catalogs of extragalactic radio sources obtained by Very Long Baseline Interferometry during the last decade agree in the mean to a few milliarcseconds (mas). Within this range the position differences show constant, linear and periodic offsets. To reduce the influence of individual catalog properties the construction of a compilation catalog seems to be the appropriate procedure. In some detail the compilation method is described providing simultaneous adjustment of source positions and catalog corrections. The compilation catalog consists of 40 objects having positional errors of 0.2 mas in right ascension (RA) and 0.3 mas in declination (Dec). Comparing this catalog with the IERS Celestial Reference Frame compiled by means of other precepts yields weighted root-mean-square differences of 0.7 mas in RA and 1.3 mas in Dec. Finally, the terms of general precession in RA and Dec are included in the adjustment process giving estimates of the correction to the luni-solar precession between -1 and -3 mas/yr, the latter figure applying when some early data are added.

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