WFPC2 Technical Instrument Report 97-06:
SMOV Check of WFPC2 PSF Stability
-Fruchter and McMaster
In order to test the stability of the WFPC2 PSF during SMOV, dithered F439W images of Omega Cen were obtained shortly after the servicing mission and were compared with similar images obtained in July of 1996. The data were combined using the drizzle algorithm. The only significant differences between the PSF's from the two epochs can be attributed to a change in focus.