Target Overview
  ===============
    Pluto is the ninth, and usually farthest, planet in the Solar
    System.  It has one moon, Charon, which is roughly half its own
    size.
 
    The following physical elements for Pluto and the Pluto-Charon
    system are quoted from 'Astrophysical Data: Planets and Stars',
    Kenneth R. Lang, published 1992 by Springer-Verlag, pages 41-47
    [LANG1992]:
 
    Pluto
    -----
      Equatorial radius            1123 km     0.176 Earth radii
      Angular Diameter at
        Closest Approach           0.08''
      Mass                         1.36e25 g   0.02561 Earth masses
      Mean Density                 1.89 to 2.14 g/cm^3
      Sidereal Rotation Period     6.38718 days
      Inclination of Equator
        to Orbit                   >= 50 degrees
      Effective Temperature        40 to 60 Kelvin
 
      Orbital Elements:
 
      Semi-major Axis              5.9e9 km    39.53 AU
      Sidereal Period              247.7 years
      Eccentricity                 0.248
      Inclination                  17.15
 
    Pluto-Charon System Elements
    ----------------------------
      Semimajor axis               19,130 km
      Period                       6.38718 days
      Charon's radius              560 km
      Orbit tilt to Ecliptic       120 degrees (retrograde)
 
 
                                      Last update: 02 December 1999
                                                   A.C.Raugh
                                                   PDS SBN
                                                   University of Maryland