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Astrophysics and Space Science

, Volume 63, Issue 2, pp 457–465 | Cite as

Optimization of lunar occultations for determining the positions of point-like X-ray sources

  • E. Born
  • H. Debrunner
Article

Abstract

In view of the scheduled satellite mission EXOSAT (European X-Ray Observatory Satellite) of ESA (European Space Agency) the lunar occultation technique to determine the position of point-like X-ray sources is investigated. An error analysis for the source coordinates resulting from this technique is presented and an occultation strategy is proposed to achieve optimum lunar occultations. The analysis takes into account the errors of the space coordinates of the satellite and the Moon, the unevenness of the lunar surface, the intensities of source and background, the apparent angular velocity of the Moon as seen from the satellite, the finite sizes of the preoccultation position error boxes of the X-ray sources and the inaccuracies in the satellite orbit correction manoeuvres necessary to achieve the occultations.

Keywords

Angular Velocity Position Error Finite Size European Space Agency Lunar Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Co. 1979

Authors and Affiliations

  • E. Born
    • 1
  • H. Debrunner
    • 1
  1. 1.Physikalisches InstitutUniversity of BernBernSwitzerland

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