By Kaitchuck and Henden, CDROM., $69.95.

In addition to writing a book on the subject Astronomical Photometry and described (described here) the authors have written a professional level computer program based upon the techniques described in their book. The software package is a fairly complete photoelectric photometry data reduction system. There are several programs, each of which handle a different aspect of the reduction process. This modularity allows the user the flexibility to adapt the reduction process to their specific needs. Specifics are:

• Input and output to the programs is via simple ASCII files.
• There are five major programs which calculate:
• dead time (if required),
• instrumental magnitudes and colors,
• air mass,
• heliocentric Julian dates,
• extinction coefficients,
• transformation coefficients to the Johnson system,
• conversion to the standard photometric system, and
• the reduction of differential photometry.

Data from either a pulse counting or DC photometer system can be reduced Programs execute on an IBM-PC or compatible. Requires only 128K memory. Automatic selection of math coprocessor, if present. Supplies as both executable (compiled) programs and FORTRAN 77 source code.