coordinates
WD1-center………………………….RA=16:47:04.7   DEC= -45:51:23.8 (Goodman)
WD1-d3…………………………………….RA=16:46:56.7   DEC= -45:52:47.4 (Spartan acquisitoion d3 sub-array)
WD1-MOSAIC-initial…….RA=16:46:41.1   DEC= -45:55:30.0 (Initial mosaic bottom-right)