NEAR Gamma-Ray Spectrometer (GRS)


    The NEAR GRS is part of the X-Ray/Gamma-Ray Spectrometer (XGRS) suite on the NEAR mission. It detects characteristic gamma rays in the 0.3- to 10-MeV range that are emitted from specific elements in the surface. Some of these emissions are excited by cosmic rays and some arise from natural radioactivity in the asteroid. The GRS uses a body-mounted passively cooled NaI scintillator detector with a bismuth germanate anticoincidence shield that defines a 45 degree FOV, with an objective of measuring abundances of several important elements such as K, Si, and Fe in four quadrants of the asteroid

    Identifier (LID)




The data sets listed in the table below are PDS3 legacy data sets. 

Data Processing Level Data set ID Mission phase Browse Download
Raw data (level 1b):
NEAR-A-GRS-2-EDR-CRUISE2-V1.0 Cruise 2 299 Mb 53 Mb
NEAR-A-GRS-2-EDR-EARTH-V1.0 Earth Flyby 144 Mb 15 Mb
NEAR-A-GRS-2-EDR-CRUISE3-V1.0 Cruise 3 269 Mb 44 Mb
NEAR-A-GRS-2-EDR-CRUISE4-V1.0 Cruise 4 276 Mb 47 Mb
NEAR-A-GRS-2-EDR-EROS/ORBIT-V1.0 Eros Orbit 719 Mb 135 Mb
NEAR-A-GRS-2-EDR-EROS/SURFACE-V1.0 Eros Surface 138 Mb 13 Mb
Calibrated data (levels 2 and 3):
NEAR-A-GRS-3-EDR-EROS/ORBIT-V1.0 Eros Orbit 411 Mb 296 Mb
NEAR-A-GRS-3-EDR-EROS/SURFACE-V1.0 Eros Surface 18 Mb 6 Mb

Highlighted data products from the above volumes:

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