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- Q: The marks of Probe and Target do not lie precisely on their own orbits, why?
A: The lines of orbits are not so accurate, by reasons as follows:
- SSVG draws the orbit as a set of line segments.
- SSVG draws the orbit of a time point and uses it through a time period.
- Q: Optimize Assistant draws a line of orbit as a polygon. Why?
A: SSVG draws a line of orbit as a set of line segments. For Optimize Assistant, SSVG reduces the number of line segments to minify the time of the drawing. (The symptom was reduced in version 1.2.0 and later)
- Q: Sometimes, the line of orbit of the Probe becomes V-shaped curved line. Why?
A: The orbit of the Probe can become hyperbolic or parabolic. In those cases, the orbits extend to infinite distance. However, SSVG draws only portions of them.
- Q: "SSVG_log" folder within the folder of SSVG contains many files with long names. May I discard them?
A: Yes, you may. Those files are log files. SSVG recorded the editing history of the Flight Plans in them.
- Q: I executed maneuvers of a sample Flight Plan and tried to see positions of the Probe in the future. Somehow, SSVG does not show the Probe on and after 2101. Why?
A: You used a sample targeting an asteroid, didn′t you? The Flight Plan uses an SPK file for the asteroid, but the file is valid until 2100. SSVG can show positions of the Probe and Target only inside of the period. SSVG can show positions of the Probe and Target only inside of the period.
- Q: I cannot get any SPK file for asteroids from the "Asteroid & Comet SPK File Generation Request" page anymore. How can I get them?
A: Use the following page of the Horizons System.
https://ssd.jpl.nasa.gov/horizons/app.html
You should select "Small-Body SPK File" for the "Ephemeris Type".
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SSVG — Solar System Voyager
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