SIMBAD references

1997A&A...318..653X - Astronomy and Astrophysics, volume 318, 653-656 (1997/2-2)

Correction to the precession constant from optical observations of extragalactic sources.

XU T.-Q., LU P.-Z. and WANG S.-H.

Abstract (from CDS):

The rediscussion of the precession constant was performed by optical observations of the counterparts of extragalactic radio sources with longer observational intervals. After a reduction of the optical catalogue systems, the fictitious `proper motions' of extragalactic radio sources were obtained in the FK5 system. On the assumption that these fictitious `proper motions' of extragalactic sources are the reflection of an incorrcet value of the precession constant, then the correction of precession constant can be estimated. The corrections are -2.60±1.35mas/yr for 43 sources and -3.35±1.62mas/yr for 24 sources, respectively. If the improvement of the 18.6-year nutation term is considered in the data processing, the corrections of the precession constant are -2.91±1.38mas/yr and -3.52±1.68mas/yr, respectively. The results were also compared with those from VLBI.

Abstract Copyright:

Journal keyword(s): astrometry - reference systems - radio continuum: galaxies

CDS comments: Table 2 : 1224-255 misprint for 1244-255

Simbad objects: 42

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