Bidiectional UV-Visible reflectance spectrum (300-420 nm) of an aggregate sample OREX-803124-0 of asteroid Bennu was remeasured using RELAB Bidirectional Spectrometer at the standard viewing geometry of 30-degree incidence and 0-degree emergence angles at 1 nm sampling intervals instead of the standard 5 nm sampling intervals to confirm the existence of a 345-nm absorption band.

20250428_VNMIR_BROWN_OREX-803124-0_1_VNMIRSpectralPoint_1.csv

20250428_VNMIR_BROWN_OREX-803124-0_1_VNMIRSpectralPoint_1.yaml

20250428_VNMIR_BROWN_OREX-803124-0_1_analysisLocation_1.jpg

20250428_VNMIR_BROWN_OREX-803124-0_1_analysisLocation_1.yaml

20250428_VNMIR_BROWN_OREX-803124-0_1_plot_1.png

20250428_VNMIR_BROWN_OREX-803124-0_1_plot_1.yaml

20250428_VNMIR_BROWN_OREX-803124-0_1_plot_2.png

20250428_VNMIR_BROWN_OREX-803124-0_1_plot_2.yaml

This material is supported by NASA under contract NNM10AA11C issued through the New Frontiers program and NASA Planetary Science Enabling Facilities program 80NSSC23K0198.

Visible, near-, and mid-infrared spectroscopy

Custom bi-directional

Brown University

Standard deviation in reflectance over entire dwell time at that wavelength

Bidirectional ultraviolet to short-wave visible reflectance spectrum of asteroid Bennu aggregate sample OREX-803124-0. The sample was placed in a 9-mm black Teflon dish with a 7.2-mm field of view. RELAB sample ID is BN-REM-002, and spectral file name is C0BN02. Reflectance is measured one wavelength channel at a time relative to Spectralon from Labsphere. 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 33 seconds. A calcite depolarizer was used.

The analyzed spot is indicated with a red circle of about 7.2 mm in diameter of OREX-803124-0 aggregate sample mounted on a 9-mm diameter black Teflon dish.

A plot of bidirectional UV-Vis reflectance spectrum of OREX-803124-0 aggregate sample over the wavelength range of 300-420 nm.

A plot of bidirectional UV-Vis reflectance spectrum of OREX-803124-0 aggregate sample over the wavelength range of 300-420 nm with the vertial (reflectance) ranges magnified.

Astromat

Remeasurement of bidirectional UV-Visible reflectance spectrum of asteroid Bennu aggregate OREX-803124-0.

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