Access to Astronomical Catalogues

← Click to display the menu
J/A+A/529/A91       Proper motions of 555 quasars from VLBI  (Titov+, 2011)

VLBI measurement of the secular aberration drift. Titov O., Lambert S.B., Gontier A.-M. <Astron. Astrophys. 529, A91 (2011)> =2011A&A...529A..91T
ADC_Keywords: QSOs ; Positional data ; Interferometry ; Proper motions Keywords: astrometry - reference systems - techniques: interferometric Abstract: While analyzing decades of very long baseline interferometry (VLBI) data, we detected the secular aberration drift of the extragalactic radio source proper motions caused by the rotation of the Solar System barycenter around the Galactic center. Our results agree with the predicted estimate to be 4-6 micro arcseconds per year (uas/yr) towards RA=266° and DE=-29°. In addition, we tried to detect the quadrupole systematics of the velocity field. The analysis method consisted of three steps. First, we analyzed geodetic and astrometric VLBI data to produce radio source coordinate time series. Second, we fitted proper motions of 555 sources with long observational histories over the period 1990-2010 to their respective coordinate time series. Finally, we fitted vector spherical harmonic components of degrees 1 and 2 to the proper motion field. Description: The file contains the mean positions and proper motions of 555 sources used to adjust the secular aberration drift. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list555.dat 94 555 Position and proper motions of 555 quasars
See also: I/251 : VLBI International Celestial Reference Frame, ICRF (Ma+, 1997) J/A+A/355/398 : Celestial Ephemeris Origin definition (Capitaine+, 2000) J/AZh/81/1032 : VLBI position measurements (Titov, 2004) Byte-by-byte Description of file: list555.dat
Bytes Format Units Label Explanations
1- 8 A8 --- IERS Radio source IERS designation 9- 18 I10 --- N Number of sessions after 1990 19- 36 F18.12 deg RAdeg Averaged right ascension, J2000 37- 54 F18.12 deg DEdeg Averaged declination, J2000 55- 64 F10.2 uas/yr pmRA Proper motion in right ascension, pmRA*cosDE 65- 74 F10.2 uas/yr pmDE Proper motion in declination 75- 84 F10.2 uas/yr e_pmRA rms uncertainty on pmRA 85- 94 F10.2 uas/yr e_pmDE rms uncertainty on pmDE
Acknowledgements: Sebastien Lambert, sebastien.lambert(at)
(End) Patricia Vannier [CDS] 15-Mar-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service