The Hubble image was created from HST data from proposal 10602: J. Maíz Apellániz (Astronomical Institution of Andalucía, Spain), N. Walborn and E. Nelan (STScI), N. Morrell (Carnegie Institution of Washington), and V. Niemela (National University of La Plata, Argentina).
This image is a composite of many separate exposures made by the ACS instrument on the Hubble Space Telescope using several different filters. Three filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are: