The observations of HH 47 are taken from HST proposals: 5114 J. Westphal (Caltech), 5504 and 6794: B. Reipurth (University of Hawaii), and 11179: P. Haritgan (Rice University).
F656N (H-alpha) and F673N ([S II])
This image is a composite of separate exposures acquired by the WFPC2 instrument on HST. 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:
Cyan: F656N (H-alpha)
Orange: F673N ([S II])