NEAR Near-Infrared Spectrometer (NIS)


    The near-infrared spectrometer (NIS) is a grating infrared spectrometer with a 32-element Ge array covering the spectral range 1348-2732 nm. The NIS stopped collecting data on 13 May 2000 for unknown reasons after taking more than 50,000 spectra covering 60% of the surface.

    Identifier (LID)




The data sets listed in the table below are PDS3 legacy data sets. Once these data sets have been migrated to PDS4 they will be listed in the section above.

Data set ID Mission phase Browse Download
NEAR-A-NIS-2-EDR-CRUISE1-V1.0 Cruise 1 6.1 Mb 2.5 Mb
NEAR-A-NIS-2-EDR-CRUISE2-V1.0 Cruise 2 8.1 Mb 3.1 Mb
NEAR-A-NIS-2-EDR-CRUISE3-V1.0 Cruise 3 17 Mb 4.5 Mb
NEAR-A-NIS-2-EDR-CRUISE4-V1.0 Cruise 4 21 Mb 5.9 Mb
NEAR-A-NIS-2-EDR-EARTH-V1.0 Earth Flyby 4.4 Mb 2.3 Mb
NEAR-A-NIS-2-EDR-EROS/FLY/BY-V1.0 Eros Flyby 4.8 Mb 2.5 Mb
NEAR-A-NIS-2-EDR-EROS/ORBIT-V1.0 Eros Orbit 172 Mb 59.3 Mb

Calibrated data from Nixel Database, original version

The MSI/NIS team used the raw NIS data and the NIS calibration tables to generate the following calibrated data file, known as the Nixel Database. The file contains 292608 calibrated spectra from the entire NIS investigation, from cruise through the end of the NIS experiment in May 2000. Spectra are presented in units of target radiance divided by solar radiance (I/F) and include derived information on the pointing of the NIS spectrometer. The file is a 326-Mbyte, FITS binary table with a non-compliant FITS header.

Data set ID Includes: Browse Download
NEAR-A-NIS-5-EDR-EROS/ORBIT-V1.0 All Phases 2.0 Gb 1.5 Gb

Calibrated data from Nixel Database, PDS-revised version

This is the revised Nixel Database with a FITS-compliant header, computed direct mission elapsed times, offset-corrected counts, and true exposure durations. (The larger size of the original data set compared to this one is due to the browse directory, which is not reproduced in the revised data set.)

Data set ID Includes: Browse Download
NEAR-A-NIS-5-EDR-ALL-PHASES-PDSREV-V1.0 All Phases 338 Mb 197 Mb

Calibrated (level 2) data, divided by subphase and UTC day-of-year:

For a time, PDS was providing the calibrated Nixel Database divided into fourteen smaller data sets by subphase and by day-of-year, to make it easier for users who had difficulty with the large (~500 Mb) file sizes of the full Nixel Database. These subdivided data sets have outlived their usefulness and are no longer being provided. 

Highlighted links:

  • NIS Subphases - a text table containing mission-elapsed time and day of year for all NIS phases and subphases.
  • NIS Browse Utility - provides coverage maps of observations, average I/F, average inclination angle, average emission angle, average phase angle, and average resolution, and also includes predictive surface maps and AVI-formatted and MOV-formatted movies of Eros.
  • NIS Sample Spectral Plots - sample spectra for users to verify that they have correctly read the NEAR NIS Nixel Database.

For questions about the data sets or this web site, contact us at