The data are from HST proposal 13631 PI: A. Simon (NASA Goddard Space Flight Center), G. Orton (NASA Jet Propulsion Laboratory), J. Rogers (University of Cambridge, UK), and M. Wong and I. de Pater (University of California, Berkeley)
This image is a composite of separate exposures acquired by the WFC3/UVIS instrument. Several filters were used to sample various wavelengths. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are: