The picture was produced by composing three, two-minute, exposures taken through R, V and B Harris photometric filters, approximating the normal red, green and blue passbands. The area shown is approximately 30x30 arc minutes, ie the full field of the Wide-Field Camera ccd mosaic at the prime-focus of the 2.54m Isaac Newton Telescope.
Previous Cambridge-Astronomy headline pictures.
psb@ast.cam.ac.uk