Implications of the Galactic aberration for CRF J/MNRAS/445/845 ivo://CDS.VizieR/J/MNRAS/445/845 doi:10.26093/cds/vizier.74450845 CDS Malkin Z. 2024-08-14T20:18:31Z 2016-06-07T10:21:03Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr interferometry very-long-baseline-interferometry astrometry During the last few years, much attention has been paid to the astrometric implications of the galactic aberration in proper motions (GA). This effect causes systematic errors in astrometric measurements at a {mu}as level. Some authors consider it so serious that it requires redefinition of the Celestial Reference Frame (CRF). We argue that such attention to the GA is exaggerated too much. It is just a small astrometric correction that must be taken into account during highly accurate astrometric and geodetic data processing. The accuracy of this correction depends on the accuracy of the Galactic rotation parameters and, for most applications, on the accuracy of the rotation matrix between Galactic and equatorial systems. Our analysis has shown that our current knowledge of these two factors is sufficient to compute the correction of the GA with an accuracy better than 10 per cent. The remaining effect at the level of a few tenths {mu}as/yr is negligible nowadays. Another consequence of introducing the GA correction is the necessity to return to classical astrometric modelling of the extragalactic radio source position - derived by very-long-baseline interferometry (VLBI) - by the linear trend model. Changing the current paradigm of the VLBI-derived CRF, based on the assumption of zero motion of radio sources, to classical one leads to bias in the radio source positions of up to several tens of {mu}as for a catalogue at epoch J2000.0. 2014MNRAS.445..845M https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/445/845 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/AJ/150/58 : VLBI ICRF2 (Fey+, 2015) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/445/845 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/445/845 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/445/845 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/445/845 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/445/845 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/445/845 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/445/845/icrf2a (ICRF2 catalogue at epoch J2000.0) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/445/845/icrf2a? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/445/845/icrf2a? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/445/845/icrf2a? 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46265 46310 46337 46342 46373 46379 46388 46394 46398 46439 46444 46448 46459 46529 46546 46562 46568 46577 46588 46709 46717 46721 46739 46762 46764 46782 46798 46801 46810 46835 46851 46868 46887 46921 46931-46932 46939 46948 46963-46966 47001 47014 47016 47050 47057 47064 47070 47080 47093 47095 47106-47107 47151 47255 47268 47327 47375 47419 47534 47540 47585 47605 47672 47747 47805 47826 47847 47882 47922 47941 47943 47969 47971 47978 48023 48048 48091 48102 48120 48123 48126 48142-48143 48182 48187 48228 48292 48300 48320 48345 48352 48362 48388 48392 48398 48407 48421-48422 48434 48460 48476 48493 48496 48507 48529 48533 48535 48541-48542 48582 48589 48595 48610 48618 48646 48666 48685 48708 48716 48724 48732 48757-48758 48761 48767 48797-48798 48805 48814 48821 48846 48878 48885 48890 48893 48901 48918 48952 48965 48985 48995 49019 49049 49069 49071 49083-49084 49127 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/445/845?format=ascii Radio default J/MNRAS/445/845/icrf2a ICRF2 catalogue at epoch J2000.0 Corr Correlation between estimates of RA and DE stat.correlation;pos.eq.ra;pos.eq.dec float recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Compar Display the data from ICRF2, Fey et al., Cat. J/AJ/150/58 and this paper meta.ref.url char ICRF2 Designation in International Celestial Reference Frame (ICRF2) meta.id;meta.main char IERS Designation in International Earth Rotation and Reference Systems Service (IERS) meta.id char RAJ2000 Hour of Right Ascension (J2000) pos.eq.ra;meta.main e_RAJ2000 Uncertainty in RAs s stat.error;pos.eq.ra double DEJ2000 Degree of Declination (J2000) pos.eq.dec;meta.main e_DEJ2000 Uncertainty in DEs arcsec stat.error;pos.eq.dec double MJD Modified Julian date of observation mean d time.epoch;obs;stat.mean float MJD0 Modified Julian date of observation start d time.epoch float MJD1 Modified Julian date of observation end d time.epoch float Nexp Number of experiments meta.number int Nobs Number of observations meta.number;obs int