spacecraft

This option does not accept input from the screen, but rather displays the orbit and spacecraft parameters read in from radioast.par or vsop.par(See the section on satellite parameter files for a description of the contents.). The orbital elements displayed are the semi-major axis , the eccentricity, the inclination (i), the right ascension of the ascending node (), argument of perigee (), and the mean anomaly (M). Examples of spacecraft parameters that may be displayed are the antenna temperatures and efficiencies at each of the 4 frequency bands at which Radioastron can observe. These orbital elements and spacecraft parameters can only be modified by editing and then saving radioastr.par or vsop.par. The modifications will then appear on the screen once the spacecraft option is chosen. See Figure on p. .