Bidiectional VNIR reflectance spectrum of dark faces of two fragments of a mottled rock sample OREX-800073-0 of asteroid Bennu was measured using RELAB Bidirectional Spectrometer at the standard viewing geometry of 30-degree incidence and 0-degree emergence angles.

20241102_VNMIR_BROWN_OREX-800073-0_1_VNMIRSpectralPoint_1.csv

20241102_VNMIR_BROWN_OREX-800073-0_1_VNMIRSpectralPoint_1.yaml

20241102_VNMIR_BROWN_OREX-800073-0_1_analysisLocation_1.jpg

20241102_VNMIR_BROWN_OREX-800073-0_1_analysisLocation_1.yaml

20241102_VNMIR_BROWN_OREX-800073-0_1_plot_1.png

20241102_VNMIR_BROWN_OREX-800073-0_1_plot_1.yaml

This material is supported by NASA PSEF grant.

Visible, near-, and mid-infrared spectroscopy

Custom bi-directional

Brown University

Standard deviation in reflectance over entire dwell time at that wavelength

Bidirectional visible and near-infrared reflectance spectrum of the dark face a fragment of asteroid Bennu sample OREX-800073-0. The sample was loaded in a 5-mm black Teflon dish with a 1.6-mm field of view. RELAB sample ID is BN-REM-008, and spectral file name is C2BN08. Wavelength range was 300-880 nm, and the data were collected at every 5 nm. Reflectance is measured one wavelength channel at a time relative to Spectralon from Labsphere while both Spectralon and each sample were spun at a speed of 1.5 seconds per rotation during the measurements. Effects of Spectralon absorption features were corrected. Each measurement at each wavelength consists of a single scan with a dwell time that varies as a function of the albedo of the material at each wavelength. Minimum dwell time is 4.5 seconds, and the maximum dwell time is 34.5 seconds. Overlap region is averaged. A quartz depolarizer was used over 300-420 nm, and a calcite depolarizer was used over the wavelength range of 400-880 nm. Albedo was adjusted to the visible range.

The analyzed spot is the central maximum spot of about 1.6 mm in diameter of the sample mounted on a 5-mm diameter black Teflon dish.

A plot of bidirectional VNIR reflectance spectrum of the dark face of a fragment of OREX-800073-0 sample.

Astromat

Bidirectional visible to near-infrared reflectance spectrum the dark faces of two fragments of mottled rock OREX-800073-0.

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