Necklace Nebula, PN G054.2-03.4
This image was created from HST data from proposal 12675: K. Noll, Z. Levay, M. Livio, C. Christian, H. Bond, L. Frattare, M. Mutchler, T. Borders, and W. Januszewski (Hubble Heritage Team/STScI).
F502N ([O III]), F438W (B), F656N (H-alpha), F555W (V), F658N ([N II]), and F814W (I)
This image is a composite of many separate exposures made by the WFC3/UVIS instrument on the Hubble Space Telescope using six different filters, three broadband filters, and three narrowband filters. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:
Blue: F502N ([O III]) + F438W (B)
Green: F656N (H-alpha) + F555W (V)
Red: F658N ([N II]) + F814W (I)