Contents.
      planet: 9 - Pluto
  satellites: 1 - P1 Charon : 2
total number: 2
        type: relative
       dates: 2005
 observatory: 250 - HST

Reference.
   Weaver, H. A.; Stern, S. A.; Mutchler, M. J. et al. (2006)
   Discovery of two new satellites of Pluto.
   Nature. V. 439. P. 943-945.
   2006Natur_439__943W

Informations.
         relative to: Pluto
     reference frame: astrometric
     centre of frame: topocentre
    epoch of equinox: J2000
          time scale: UTC
           reduction: geometric distortion corrections
         coordinates: apparent distance, position angle
    diff. refraction: no information
            receptor: CCD
           telescope: Wide-Field Channel (WFC) mode of the Advanced Camera for Surveys (ACS) of the HST
           observers: H. A. Weaver, S. A. Stern, M. J. Mutchler, A. J. Steffl, M. W. Buie, W. J. Merline,
                      J. R. Spencer, E. F. Young, L. A. Young

 data included in standard data file: no

Comments.
  Coordinates of Charon relative to Pluto were obtained from the 'centre-of-light' positions of Pluto and
  Charon. Hence O-C residuals can be greater than those of other observations made with the HST.

Format.
  1. Year of the date of observation
  2. Month of the date of observation
  3. Day of the date of observation with decimals
  4. S (separation) in arcsecs
  5. P (position angle) in degrees
  6. Observed visual magnitude, V
 
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Year    Day        S     P      V
  Month          arcsec deg   
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