Improved Orbital and Physical Parameters for the Pluto-Charon System

  title={Improved Orbital and Physical Parameters for the Pluto-Charon System},
  author={David J. Tholen and Marc Buie and Richard P. Binzel and Marian L. Frueh},
  pages={512 - 514}
Analysis of the observations of several Pluto-Charon occultation and transit events in 1985 and 1986 has provided a more detailed knowledge of the system. The sum of the radii of Pluto and Charon is 1786 � 19 kilometers, but the individual radii are somewhat more poorly determined; Pluto is 1145 � 46 kilometers in radius and Charon is 642 � 34 kilometers in radius. The mean density of the system is 1.84 � 0.19 grams per cubic centimeter, implying that more than half of the mass is due to rock… 
Triton, Pluto and Charon
The interiors of Pluto and Charon: Structure, composition, and implications
The authors review recent models of the internal structure of Pluto and Charon made possible by analysis of the Pluto/Charon mutual events. At a mean density of just over 2 g cm{sup {minus}3} and a
IRAS Serendipitous Survey Observations of Pluto and Charon
An upper limit of approximately 9 meter-amagats is placed on the column abundance of a methane atmosphere on Pluto, which is comparable to recent upper limits based on independent ground-based spectroscopy.
Pluto's structure and composition suggest origin in the solar, not a planetary, nebula
The mean density of the Pluto-Charon system is now accurately known at 1.99±0.09 g cm–3 (With formal errors five times smaller)1, through observations of total occultations and transits2. Even
Hemispherical Color Differences on Pluto and Charon
Both Pluto and Charon are found to have relatively uniform longitudinal color distributions with lσ upper limits of 2% and 5%, respectively, for any large-scale hemispherical color asymmetries.
This note collects scientific references of papers dealing with eclipse and occultation phenomena that are similar to the mutual events of Jupiter satellites from the point of view of the observing
Water frost on Charon
The current series of mutual eclipses between Pluto and its satellite, Charon, provides a very powerful means of probing the most distant known planet in our Solar System. Observations from 1985 and
The Surface Composition of Charon: Tentative Identification of Water Ice
The 3 March 1987 Charon occultation by Pluto was observed in the infrared at 1.7, 2.0, and 2.35 micrometers, and measurements suggest the existence of water ice on Pluto's moon.


The Detection of Eclipses in the Pluto-Charon System
Careful observations of these eclipses will allow greatly improved determinations to be made of several physical parameters for the Pluto-Charon system: the diameters of the planet and satellite, the surface albedo distribution on one hemisphere of thePlanet, the orbit of the satellite, and the mass of the Planet and hence its density.
The orbit of Pluto's satellite
Nineteen speckle interferometric observations of the Pluto system have been used to improve the determination of the orbital elements for Pluto's satellite. Calibration uncertainties appear to be the
Pluto-Charon mutual event predictions for 1986
Circumstances are tabulated for 81-Pluto-Charon mutual events occurring during the 1986 opposition. The deepest and longest events will occur in February and reach a depth of about 0.15 mag.
Circumstances for Pluto-Charon mutual events in 1988
Circumstances are tabulated for 88 Pluto-Charon mutual events occurring during the 1987 opposition. Charon is predicted to be completely obscured either by Pluto or Pluto's shadow during each passage
Modeling Pluto-Charon mutual eclipse events. I. First-order models
The present first order analytical and numerical models of light curves due to mutual events between close planetary binaries, the effects of shadowing are included. Attention is given to the case of