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This page provides access to the near-infrared spectral data obtained by Hayabusa NIRS. NIRS is a grating infrared spectrometer, in which light is directed by a grism onto a 64-channel InGaAs photodiode array detector. A shutter can be chopped for dark current measurement and two calibration lamps are carried to monitor the response level of detector.

Data Set Description

NIRS spectral data are archived in FITS format consisting headers and binary tables. In the FITS headers the status packet data and some incremental information are listed. The FITS data set are packed as a compressed tarball with respect to each observation date.

- FITS Binary Table Notes -

Array Unit
NAXIS1 - Channel Number (1-64)
NAXIS2 - 1: Average 2: Deviation 3: Maximum 4: Minimum
Level 1 - Voltage
Level 2 - Standard reflectance unit I/F.

Calibration Information

The NIRS calibration procedure uses the ASCII table files (NIRS_VOL2RAD_PLS.TAB for point light source and NIRS_VOL2RAD_ALS.TAB for area light source) to convert from raw NIRS output (Voltage) to radiance and the file (NIRS_SOLAR_SPC.tab) to convert to I/F. To download all these files, click on here.

Database Browse

If the view list button is clicked on after setting the data level and observation target through the following select boxes, a list of the specified data will appear below. Please fill the check boxes of data that you want and click on the download button.

Data Level: Target:

There is some difference in the NIRS data between DARTS and PDS, but basically the same data. In DARTS NIRS data, the max and min of NAXIS2 is invalid partially, and PDS correct it. In addition, there is rich information to use in PDS label. We recommend using the PDS data.