I've uploaded (with Jeff Hunt's help) a 16-bit Windows program called Track16 to ftp://ftp.satellite.eu.org/pub/sat/programs/ibmpc/ with the filename Track16b.zip. It's intended to be similar to Trakstar. I've always liked Trakstar for taking a close look at SGP4's and SDP4's prediction numbers for a given pass. I wrote Track16 because I wanted to improve upon Trakstar's 200 elset limit and to have a faster user interface than Trakstar's somewhat quirky ANSI input screens. Track16 is a "usable beta." There are some rough edges with the program's interface, but even so I still think it's an improvement over Trakstar. Track16 uses TS Kelso's SGP4/SDP4 routines with some minor modifications, most notably to fix the SDP4 "jump" as discussed here by Rob Matson some time ago. Track16 will write SGP4/SDP4 output to either your screen or to a file. It provides: satellite lat + long subpoint; height; range; azimuth and elevation; R.A. and declination; elset age at prediction time in decimal days; flags for above user's horizon, visible or in shadow; state vectors (ECI xyz coordinates); solar elevation; and will read in and compute a magnitude estimate using the standard magnitude if Ted Molczan's elsets are used. As was just discussed here, Track16 is NOT Year 2000-compliant. It cannot use elsets with an epoch beyond Dec. 31, 1999. Maybe by then I'll release a final version of Track16 :) __________________________________________________ Jim Varney 121.398W 38.458N 8m Sacramento, CA jamesv@softcom.net, sat_watcher@rocketmail.com A diplomat is a man who always remembers a woman's birthday but never remembers her age. --Robert Frost _____________________________________________________________________ Sent by RocketMail. Get your free e-mail at http://www.rocketmail.com