AA_51.ZIP 154200 11-27-95 AA 5.1 computes the orbital positions of | planetary bodies and performs rigorous | coordinate reductions to apparent geocentric | and topocentric place (local altitude and | azimuth). It also reduces star catalog | positions given in either the FK4 or FK5 | system. C source code is included. (Steve | Moshier) (Reg.Fee: $0) APRTRAK.ZIP 693565 06-10-96 APRtrak provides a mechanism for plotting | the positions of stations and objects world | wide based on both lat/long and grid square. | It evolved from the APRS (Automatic Packet | Reporting System) software which is a packet | program for tracking mobiles using GPS units | interfaced to standard AX.25 packet radios. | The objective of APRtrak is to provide this | same tracking and plotting capability for | spacecraft and satellite ground stations. Not | only does APRtrak satisfy the inherent | curiosity that all amateur radio operators | have about the locations of other stations, | but it also helps newcomers to radio | visualize the three dimensional and | geographic aspects of satellite | communications. (Reg.Fee: $0) FLYBY.ZIP 129315 04-02-96 FlyBy 1.0 determines the patched-conic | gravity-assist interplanetary trajectories | between any three planets of our solar | system. Patched-conic gravity-assist | trajectories are useful for preliminary orbit | design. The program is driven by simple | user-defined name lists of information which | can include departure, flyby and arrival | planets, the launch calendar date, and grid | search parameters. (C. David Eagle) (Reg.Fee: | $0) G3BODY.ZIP 33357 04-02-96 G3Body 1.0 simulates the motion of a space | craft in the Earth-Moon system, based on the | solution of three-body problems. (C. David | Eagle) (Reg.Fee: $0) GENTRA.ZIP 281309 04-02-96 Gentra 1.0 performs generalized trajectory | analysis. It can calculate orbital parameters | such as flight path angle, geodetic | coordinates, perigee and apogee altitudes and | velocities, solve Kepler equations for | elliptical orbit, convert between Julian | dates and Universal time, and more. (C. David | Eagle) (Reg.Fee: $0) GRMOTION.ZIP 32797 04-02-96 GRMotion 1.0 displays the relative motion | between two satellites in circular orbits. | (C. David Eagle) (Reg.Fee: $0) GRNDTOUR.ZIP 169298 04-13-94 GrandTour simulates space as seen from the | Voyager and Giotto spacecraft. It also | generates scenes from arbitrary points in | space or the Earth, with the spacecraft | visible to the observer. The planet, moons, | and rings of interest (or comet, nucleus, and | tail), stars, the sun, and the spacecraft are | all accurately drawn with wireframe | representations. Hidden line removal is done | for the body surfaces. For color EGA/VGA | devices, stars are color coded according to | spectral type. (John D. Callahan) (Reg.Fee: | $12) IPTO.ZIP 119325 04-02-96 Interplanetary Trajectory Optimization 1.0 | determines the patched-conic interplanetary | trajectory between any two planets of our | solar system. A patched-conic trajectory | ignores the gravitational effect of both the | launch and arrival planets on the trajectory. | The solution is based on solving Lambert's | problem relative to the sun. Patched-conic | trajectories are suitable for preliminary | mission design. (C. David Eagle) (Reg.Fee: $0) KOMS300.ZIP 91070 12-30-95 Komsoft 3.0 is a database for comet watchers. | It contains orbital elements of several | comets, a program to calculate precise | positions, functions to calculate the | diameter of astronomical images, support for | comet observation formats published by IAU, | and more. Sample comet observations are | included. (Stefan Beck) (Reg.Fee: $20-25) NPOE.ZIP 669478 04-02-96 Numerical Prediction of Orbital Events 1.0 | models important orbital events and predicts | the long term evolution of satellites in | earth orbits. It can accurately predict the | time, geometric, and dynamic orbit | characteristics for any user-defined value | including true anomaly, argument of latitude, | geocentric declination, geodetic altitude and | latitude, orbital speed, and more. It can | also determine the time and orbital | characteristics of discrete events such as | ascending and descending node crossings, rise | and set conditions of a satellite relative to | a ground site, and visibility conditions of | the sun or moon relative to a satellite. A | pair of companion graphics programs is | included to plot data and save it to PCX | format. (C. David Eagle) (Reg.Fee: $100) OOTA.ZIP 308353 04-02-96 Optimal Orbital Transfer Analysis 1.0 | determines the optimal one or two impulse | coplaner or non-coplaner orbit transfer | between two user-defined elliptic earth | orbits. The solution is a true anomaly grid | search using a combination of | multi-dimensional minimization and | one-dimensional root-finding. (C. David | Eagle) (Reg.Fee: $0) PCTRK31.ZIP 672634 07-08-95 PC-Track 3.1 can track up to eight satellites | in real time with 3D graphics and flat map | displays. It provides the antenna pointing | data necessary to transmit signals to or | receive signals from satellites. It features | informative printouts; downlink frequency | display, showing doppler shift; multiple maps | available of world and continents; support | for UTC time or LOCAL time; support for the | metric or English system; an Azimuth | Elevation chart which displays relationship | of object to observer; a utility that will | scan for next available orbits; a conversion | utility for converting NORAD/NASA two line | orbital elements to PC-Track format and much | more. Requires 2.5meg of disk space, 640K, | and EGA/VGA.f disk space, and VGA. (Thomas C. | Johnson) (ASP) (Reg.Fee: $50) RISESET.ZIP 128184 04-02-96 RiseSet 1.0 creates a data file and | azimuth/elevation graphics of visibility | conditions of Earth satellites relative to an | observer anywhere in the world. It can also | create polar plots of the azimuth and | elevation of a satellite during visibility | passes. This program uses the NORAD SGP4 | propagator for orbit predictions and is | designed to read a single satellite from a | database of Two Line Elements sets posted on | many BBS and Internet sources. A sample TLE | database is included. (C. David Eagle) | (Reg.Fee: $0) SAC.ZIP 872737 07-21-94 Foxpro SAC System is a set of programs | designed to record and track the Saguaro | Astronomy Club Database. This database | includes deep-sky and double star objects. (C | & R Business Systems Ltd.) (Reg.Fee: $90) SATGRAPH.ZIP 180739 04-02-96 SatGraph 1.0 creates orthographic and | Mercator plots of a satellite ground track, | and true view images of the Earth as seen | from a satellite. The program reads | comma-delimited ASCII data files containing | the satellite latitude, longitude and | altitude as a function of time. Images can | saved as PCX files. (C. David Eagle) | (Reg.Fee: $0) SATPLOT.ZIP 375803 04-02-96 SatPlot 1.0 propagates satellite orbits and | displays the ground track and orbit during | visibility conditions. The program can use | the NORAD SGP4 algorithm, Kozai's secular | perturbation method, a fast analytic orbit | propagator, or a seventh-order | Runge-Kutta-Fehlberg numerical integration | technique. (C. David Eagle) (Reg.Fee: $0) SHADOW1.ZIP 38974 04-02-96 Shadow Conditions of Satellites 1.0 creates | graphs demonstrating the shadow conditions of | Earth satellites in circular orbits. (C. | David Eagle) (Reg.Fee: $0) SOP9445A.ZIP 287178 02-02-95 STSOrbit Plus 9445 is an orbital tracking and | display program for use during Space Shuttle | missions, for simulating a Space Shuttle | mission, or for general satellite tracking. | It displays the approximate orbital position | and ground track of the Space Shuttle on a | global map during a typical NASA mission. | When used with NASA/NORAD 2-Line Elements, | other satellite ground tracks may also be | displayed. NEW: corrected problem with | orbit numbering during space shuttle | missions, now operates with DOS clock set to | local or UTC time, added internal time zone | abbreviations for Hawaii, Yukon, and Atlantic | zones. (David H. Ransom, Jr.) (Reg.Fee: $0-10) YALE_BSC.ZIP 701762 03-18-96 Yale-BSC 1.0 is a database of information for | amateur astronomers. It includes details on | over 9,000 stars, including right ascension, | declination longitude, latitude, spectral | class, magnitude, and more. (R. John Broad) | (Reg.Fee: $0)