Cruise measurements taken with the near XGRS

R. Starr, P. E. Clark, L. G. Evans, S. R. Floyd, T. P. McClanahan, J. I. Trombka, W. V. Boynton, S. Bailey, J. Brückner, S. W. Squyres, J. O. Goldsten, R. L. McNutt

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The X-ray/Gamma-ray Spectrometer on the Near Earth Asteroid Rendezvous spacecraft will remotely detect characteristic x-ray and gamma-ray emissions from the surface of 433 Eros to develop global maps of the elemental composition of the asteroid surface. Solar excited x-ray fluorescence in the 1 to 10 keV range will be used to measure the surface abundances of Mg, Al, Si, Ca, Ti, and Fe with spatial resolutions down to 2 km. Gamma-ray emissions in the 0.1 to 10 MeV range will be used to measure cosmic-ray excited emissions from such elements as O, Si, Fe, and H as well as naturally radioactive elements K, Th, and U to surface depths on the order of 10 cm. In-flight calibrations are essential to the understanding and analysis of data collected at Eros.

Original languageEnglish (US)
Pages (from-to)1159-1162
Number of pages4
JournalAdvances in Space Research
Issue number9
StatePublished - 1999

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)


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