Dear Mr. Clark, > I am looking for suggestions for photometry software other than packages > such as Astrometrica that rely on catalogs such as GSC as the magnitudes > in these can be unreliable. > > At the moment I am using PCVISTA but it does have difficulty in handling > the images. I do not have Linix so I cannot use IRAF. If you are used to the Java, how about the PIXY System 2, available at the MISAO Project Home Page? http://vsnet.aerith.net/misao/ Although the PIXY System 2 is on the way to be improved, right now it can read GSC 1.1 and USNO-A1.0/2.0, and the USNO data obtained at the VizieR Service, and you can measure R.A., Decl. and magnitude of all stars in your image automatically. Regards, -- Seiichi Yoshida comet@aerith.net http://vsnet.aerith.net/