Orbital requirements for an astronomical roentgen observatory satellite

Details Orbital requirements for an astronomical roentgen observatory satellite Orbital requirements for an astronomical roentgen observatory satellite

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jbis...28..763c&link_type=abstract

British Interplanetary Society, Journal, vol. 28, Dec. 1975, p. 763-778.

Astronomy and Astrophysics

Astronomy

Esa Satellites, Orbital Elements, Satellite Orbits, Spaceborne Telescopes, X Ray Telescopes, Astronomical Observatories, Cos-B Satellite, Eccentric Orbits, Feasibility Analysis, Graphs (Charts), Launch Vehicles, Launch Windows, Stabilized Platforms, X Ray Sources

Scientific paper

During prefeasibility studies for a proposed astronomical roentgen observatory satellite, a preliminary examination was made of the orbital requirements. Although consideration of this project has now ceased and no further work is being performed, the results of the studies are presented in this paper since they are believed to be of general interest. The preferred orbit has a large eccentricity, a near-polar inclination and perigee near the southern apex. The orbital stability is dominated by the very-long-term luni-solar perturbations which depend mainly on the orientation of the orbit with respect to the orbital planes of the disturbing bodies. There is no difficulty in satisfying the experimental requirements for a mission duration of one year. If a lifetime of four years is required, however, the launch time must be carefully selected or the orbit must be slightly modified. Short closures in the launch window can arise, possibly with a frequency of twice per lunar month. It is possible that new launch window constraints might have been introduced as the spacecraft design became better defined.

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