HP Forums
single impulse deorbit from an elliptical orbit - Printable Version

+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Software Libraries (/forum-10.html)
+--- Forum: HP Prime Software Library (/forum-15.html)
+--- Thread: single impulse deorbit from an elliptical orbit (/thread-19139.html)

single impulse deorbit from an elliptical orbit - cdeaglejr - 11-14-2022 01:45 PM

This HP Program calculates the single impulsive deorbit maneuver required to establish a reentry altitude and flight path angle relative to a non-rotating, spherical Earth. The algorithm uses a tangential delta-v applied opposite to the velocity vector of an initial elliptical orbit to establish the de-orbit trajectory.

The following is a "hard-wired" example with the program input in bold font.

// perigee altitude (kilometers)

hp := 285.798;

// perigee radius (kilometers)

rp := req + hp;

// apogee altitude (kilometers)

ha := 35785.922;

// apogee radius (kilometers)

ra := req + ha;

// entry altitude (kilometers)

hentry := 111.252;

// entry flight path angle (degrees)

fpae := -4.0;

The software will compute and display the orbital elements of the deorbit trajectory and the magnitude of the required deorbit delta-v.

The zipped archive for the software and documentation for this example can be downloaded from