In Hubble Space Telescope ( HST ) Cycle 17 , we imaged the well known globular star cluster 47 Tucanae for 121 orbits using the Wide Field Channel ( WFC ) of the Advanced Camera for Surveys ( ACS ) and both the UVIS and IR channels of the newly installed Wide Field Camera 3 ( WFC3 ) instrument ( GO-11677 , PI – H. Richer ) .
This unique data set was obtained to address many scientific questions that demand a very deep , panchromatic , and panoramic view of the cluster ’ s stellar populations .
In total , the program obtained over 0.75 Ms of imaging exposure time with the three HST cameras , over a time span of 9 months in 2010 .
The primary ACS field was imaged in the two broadband filters F 606 W and F 814 W filters , at 13 orientations , for all 121 orbits .
The parallel WFC3 imaging provides a panchromatic ( 0.4 – 1.7 micron ) and contiguous imaging swath over a 250 degree azimuthal range at impact radii of 6.5 – 17.9 pc in 47 Tuc .
This imaging totals over 60 arcmin ^ { 2 } in area and utilizes the F 390 W and F 606 W broadband filters on WFC3/UVIS and the F 110 W and F 160 W broadband filters on WFC3/IR .

In this paper , we describe the observational design of the new survey and one of the methods used to analyze all of the imaging data .
This analysis combines over 700 full-frame images taken with the three HST cameras into a handful of ultra-deep , well-sampled combined images in each of the six filters .
We discuss in detail the methods used to calculate accurate transformations that provide optimal alignment of the input images , the methods used to perform sky background offsets in the input stack and the flagging of deviant pixels , and the balance reached between the input pixel drop size onto an output super-sampled pixel grid .
Careful photometric , morphological , and astrometric measurements are performed on the stacks using iterative PSF-fitting techniques , and reveal unprecedented color-magnitude diagrams ( CMDs ) of the cluster extending to > 30th magnitude in the optical , 29th magnitude in the UV , and 27th magnitude in the IR .
The data set provides a characterization of the complete stellar populations of 47 Tuc , extending from the faintest hydrogen burning dwarfs through the main-sequence and giant branches , down to very cool white dwarf remnants in the cluster .
The imaging also provides the deepest probe of the stellar populations of the background Small Magellanic Cloud ( SMC ) galaxy , resolving low mass main-sequence dwarfs with M \lesssim 0.2 M _ { \odot } .