Scheila’s orbit lies in the outer asteroid belt at a semi-major axis of 2.926 AU from the Sun. During the time of the Hubble observations, the asteroid was ~3.1 AU from the Sun, and ~2.3 AU from Earth.
The image was created from Hubble data from proposal HST proposal 12435: D. Jewitt (University of California, Los Angeles), H. Weaver (JHU/APL), M. Mutchler (STScI), S. Larson (University of Arizona), and J. Agarwal (ESA/ESTEC, University of Potsdam).
This image was originally black and white and recorded only overall brightness. These brightness values were translated into a range of bluish hues. Such color "maps" can be useful in helping to distinguish subtly varying brightness in an image.