1. XI XiaoJin NATIONAL TIME SERVICE CENTER CHINESE ACADEMY OF SCIENCES

2.  Science and technology foundation work project : Digitization of Astronomical plates, 2011  About 30000 astrophotographic plates  Obtained in last 100 years  Collected from all the observatory THE PHOTOGRAPHIC PLATES

3.  Epson 10000XL scanner  linear CCD camera  maximum optical resolution: 2400 dpi  the maximum scanning dimension 31.0 cm × 43.7cm  scanning in linear mode. AN EXPERIMENT WITH COMMERCIAL SCANNER

4.  28 plates total, on Kodak 103ao plates  Without filter  Including: Saturn satellites Uranus satellites Jupiter satellites. PLATES,

6. Two telescopes:  1.0m astrometric reflector at The Yunnan Astronomical Observatory ( YNAO ， E102.°797 ， N24.°882 ， H2000m, code 286)  The 0.32m astrometric reflector at the Tsingtao Observatory (E120.°317, N36.°067, H 75m, code 334). TELESCOPE

8.  Marks left on plates  Data in linear CCD direction, which perpendicular to the scanning direction.  JPG format  Transform into TIFF format 1200 dpi 16-bit Grayscale 110MB. DIGITIZATION and PROBLEMS

9.  The scanned image before cleaning marks (a) and the scanned image after cleaning marks (b).

10.  The example of scanned images with different scanning parameters. (a) is a digital image with inappropriate scan parameters, and (b) is a digital image with appropriate scan parameters.

11.  Scanning information: scanner name, author of scan, scan time, scan parameters, the size of plat, and Image scale (arcsec/pixel).  The observation information: target name, observatory, observer name, telescope (diameter, focal length and view field), center of plate(RA 、 DEC) and epoch, observation time, exposure time and filter type. HEAD FILE

12.  obtaining 125 measurement positions of satellites from the 28 plates  92 for Saturn satellites,  24 for Uranus satellites  9 for Jupiter satellites RESULTS

13. Table 2 An extract from the list of the observed equatorial coordinates of satellites obtained here. They are topocentric and referred to the J2000 ICRF reference frame.

14.  The theoretical positions IMCCE ephemeris DE431 planetary ephemeris  (Lainey v2.0) for the Galilean satellites of Jupiter  (Lainey et al. 2015) for the Saturnian satellites  (Emelianov & Nikonchuk, 2013) for the Uranian satellites COMPARE with THEORETICAL POSITIONS

15. Table 3. Mean residuals and standard deviations of the residuals of the satellites, expressed in arcsecond, The paper about this section has been submitted to MNRAS. We are waiting for the referee comments.

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