Hubble ACS Image of NGC 4163
9.5 million light-years or 2.9 megaparsecs
88 arcseconds (4,000 light-years or 1,200 parsecs) wide
The image was created from Hubble data from proposal 9771: I. Karachentsev (Russian Academy of Sciences, Special Astrophysical Observatory), B. Tully (University of Hawaii), V. Karachentseva (Kyiv University), A. Dolphin (Raytheon Company), S. Sakai (University of California, Los Angeles), E. Shaya (University of Maryland), and M. Sharina, L. Makarova, and D. Makarov (Russian Academy of Sciences, Special Astrophysical Observatory).
The science team comprises: K. McQuinn and E. Skillman (University of Minnesota, Minneapolis), J. Cannon (Macalester College, MN), J. Dalcanton (University of Washington, Seattle), A. Dolphin (Raytheon Company), and D. Stark and D. Weisz (University of Minnesota, Minneapolis).
F606W (R) and F814W (I)
These images are composites of several separate exposures made by the ACS instrument on the Hubble Space Telescope. Two filters were used to sample broad wavelength ranges for each image. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are orange/yellow for the I-band (F814W) and cyan/blue for the wide V-band (F606W) filter. The images have been further adjusted so the colors more closely resemble their true visual appearance, particularly the red hydrogen emission of the star-forming regions.
Cyan: F606W (R)
Yellow: F814W (I)