Table 1: Parameters for the imaging polarimetry of Uranus and Neptune for November 30, 2003. The planet parameters were taken from the "The Astronomical Almanac 2003''. The South pole coordinates are given as distance from the disk center and position angle (see Fig. 1). For the filters the central wavelength $\lambda _{\rm c}$ and the band width $\Delta \lambda $ (FWHM) are given.
  Uranus Neptune $\lambda _{\rm c}$ $\Delta \lambda $
      [nm] [nm]
planet parameters        
   diameter 3.51'' 2.24''    
   phase angle 2.8$^\circ$ 1.7$^\circ$    
   S pole dist. 1.62'' 0.97''    
   S pole PA 78$^\circ$ 169$^\circ$    
exposures        
   R (Bessell) - $3\times (4\times 1~{\rm s})$ 644 167
   i (Gunn) $3\times(4\times1$ s) $3\times(4\times4$ s) 803a 151a
   zb (Gunn) $3\times(4\times4$ s) $3\times(4\times10$ s) a,b a,b
    $\lambda_{673}$+mask $4\times300$ s - 673 6.1
    $\lambda_{729}$+mask $4\times300$ s - 729 7.6
a The effective central wavelengths $\lambda _{\rm c}$ and filter widths $\Delta \lambda $ differ significantly if the efficiency curve of the detector is included. They are for the i-filter $\lambda_{\rm c} = 786$ nm and $\Delta\lambda=140$ nm and for the z-filter $\lambda_{\rm c} = 890$ nm and $\Delta\lambda= 100$ nm.
b the z-filter is a long-wave pass filter for $\lambda>837$ nm.


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