USE OF STANDARD SCANNING DEVICE IN ASTROMETRIC REDUCTION OF
PHOTOGRAPHIC OBSERVATIONS OF PLANETS AND NATURAL SATELLITES.

A.A.Kisselev, T.P.Kisseleva, K.N.Zamarashkin
(The Main Astronomical Observatory at Pulkovo, Pulkovskoe
shosse, 65-1, St.-Petersburg, 196140, Russia.)


The applicability of a scanner in coordinate measurements of
stars and Solar system objects on the photoplates is shown.
The Hewlett Packard IIP scanner was used for measurements.
Calibration of the scanner was done by comparison of
measurements of chozen photoplate containing M13 both with the
scanner and the semi-automatical measuring tool "Ascorecord".
It was founded out that position of an image on the scanner
could be estimated with accuracy of 1/2 of the pixel. For
instance, for angular distance between the components of the
double star ADS 11632( six images on the plate) it has been
got: r= 13".114 +/- 0."189 . Measurements of the Saturnian
satellites system were performed with the same order of
accuracy. Resolution of the scanner (600 dpi) was not enough
for precise coordinate measurements, but it should be expected
to have the accuracy comparable to that been got by usual
means if a scanner with resolution no less than 3000 dpi would
be used.