Remote planetary geochemical exploration with the NEAR X-ray/gamma-ray spectrometer

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

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The X-ray/gamma-ray spectrometer (XGRS) instrument onboard the Near Earth Asteroid Rendezvous (NEAR) spacecraft will map asteroid 433 Eros in the 0.2 keV to 10 MeV energy region. Measurements of the discrete line X-ray and gamma-ray emissions in this energy domain can be used to obtain both qualitative and quantitative elemental composition maps of the asteroid surface. The NEAR X-ray/gamma-ray spectrometer (XGRS) was turned on for the first time during the week of 7 April 1996. Rendezvous with Eros 433 is expected during December 1998. Observations of solar X-ray spectra during both quiescent and active periods have been made. A gamma-ray transient detection system has been implemented and about three gamma-ray transient events a week have been observed which are associated with either gamma-ray bursts or solar flares.

Original languageEnglish (US)
Pages (from-to)572-576
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-3
StatePublished - 1999

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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