I finally got a chance to analyze the M92 data I took with WIRC last September. Based on the positions and proper motions of 365 stars in the WIRC2K image (from Tucholke, Scholtz, & Brosche 1996, A&Ap, 312, 74), I found an image scale of 0.2487 arcsec/pixel. The residuals were quite small (rms 0.286" RA and 0.296" Dec). The 4-coefficient fit and the 6-coefficient fit agree quite well, and I don't see any systematic problems in the residuals. which suggests that there is very little distortion in the camera. The camera was rotated 1.39 degrees relative to N and E directly along rows and columns. If anyone wants this data to do further analysis, I would be happy to pass it along. If you are still looking for PR images, see if either of these are useable: http://irastro.caltech.edu/~djt/M42.jpg (Orion Nebula, 60s in BrGamma) http://irastro.caltech.edu/~djt/M92.jpg (Used for astrometry) Best regards, Dave. --------------------------------------------------------- David Thompson MS 320-47 Caltech djt@irastro.caltech.edu Pasadena, CA 91125 USA