This collection consists of two oversize pressboard binders containing several computer printouts each. One pressboard binder is labeled "S-Band Parameter Variations" and contains nine printouts. The other is labeled "X-Band Baseline" and contains six printouts. The S-Band Parameter Variation printouts are in Boxes 1 and 2, and the X-Band Baseline printouts are in Box 3. Run in early 1989, prior to the deployment of the Galileo spacecraft, each computer printout is the product of a FORTRAN program run on a Digital Equipment Company (DEC) VAX/VMS mainframe computer at the Jet Propulsion Laboratory, operated by Vincent M. Pollmeier of Section 314, the Navigation Systems Section. The printouts have been removed from the pressboard binders, with their original order maintained. The computer programs that produced the printouts were part of the Orbital Data Processing System (ODPS). Both binder sets of printouts have notations on their spines, handwritten with felt tip pens. The spine of the S-Band Parameter Variations binder is marked "S-Band (Jup. App.) Parameter Variations." The spine of the X-Band binder is marked "X Band (Jupiter Approach) Baseline." The nine printouts in the S-Band binder are dated from March 7, 1989 through February 22, 1989. Each successive printout appears to contain revisions to the prior run of the program. The X-Band binder contains six printouts, all dated February 15, 1989. There is no accompanying documentation describing the purpose of the computer program printouts. Based on the handwritten markings, and some of the limited lines of descriptive programming instructions, as well as examining the printout data, it appears that the programs were being used to determine one or both of the following: (1) computation of the trajectory and velocity of the Galileo spacecraft as it approached Jupiter on December 7, 1995 for the release of the atmospheric probe, or (2) calculations used to determine the possible ranges available for signal data transmission to Earth at the time of Jupiter approach. There is also implied a consideration of X-band instead of S-band for Galileo telemetry.
