Pixel Movement of Planet X

I calculated the speed of PX in the sky: (pixels of the following DSS : http://membres.lycos.fr/dcorb/N/path/dssRed.04.20.00+12.00.00.fits.gz )

between 02/09 - 02/15 : mean speed ~= 5.0 pixels / hour

between 02/15 - 02/22 : mean speed ~= 3.6 pixels / hour

example : for 02/15 coordinates, PX should move by ~ 4.3 pix/hour

so PX must begin to spread out in the direction on its movement, on a long exposure.

Pierre-Eric