= 0.0027 ± 0.0014
The abscissa residuals provided by the FAST and NDAC data reduction consortia are published in the Hipparcos Catalogue (ESA 1997). Applying single star criteria and a goodness-of-fit parameter |F2| smaller than 1.0 we selected 1 944 098 and 2 002 496 residuals corresponding to 63 216 FAST and
from the value
= 1
assumed in the General Theory of
Relativity, (2), a zero-point correction of the Hipparcos parallaxes
and, (3), linear and quadratic variations with time.
and the zero-point correction, which suggests the avoidance of simultaneous
estimations of these parameters. In these circumstances we obtain
= 0.0027 ± 0.0014
= -0.0010 ± 0.0016
- parameter. For both sets of
residuals the zero-point corrections are negligibly small and
statistically insignificant. The linearly time-dependent term is of the
order of 0.02 milliarcsecond/yr in FAST and NDAC, but of opposite sign.
Their 10- and 7-
significance is remarkable. Moreover, a
significant quadratic time dependence results from the FAST
residuals.
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Created: 13 Jul 1999 e-mail : R.Hering, ARI
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