(1980, Mon. Not. R. Aston. Soc. 192, 47p–50p) have been fit by a model that includes possible differential refraction by an atmosphere, followed by an abrupt occultation by Charon's limb. We find a lower limit (3 σ, where σ = 0.8 km) on Charon's radius of 601.5 km, which ...
The potential to determine Pluto's radius from mutual event lightcurves, HST imaging, and Charon's radius and orbital parameters Presentation of a GUI that can determine the limb of a planet in an image to within a quarter pixel. We discuss applications to the New Horizons encounter. E Young...