Dr. Sabrina Schwinger Profile

Dr. Sabrina Schwinger

at Deutsches Zentrum für Luft- und Raumfahrt eV

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Proceedings Article | 16 September 2020 Presentation + Paper

Thermal emission and reflection spectral library of rocks for the interpretation of CHANG’E 4 and planetary mission data

A. Maturilli, J. Helbert, G. Alemanno, S. Schwinger, A. Neumaier, Y. Wu

Proceedings Volume 11502, 1150209 (2020) https://doi.org/10.1117/12.2567648

KEYWORDS: Reflection, Spectroscopy, Reflectivity, Databases, Statistical analysis, Iron, Ultraviolet radiation, Calibration

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Remote spectroscopic observations of the lunar surface is now complemented by in situ reflectance spectra obtained by the Chang’E 3 and Chang’E 4 missions. The material at landing site includes also a fragment of rock with a small- to medium grained plutonic texture. Current spectral databases primarily contain spectra measured on powder samples, while spectra of coarse-grained rock samples are rare. Rock samples returned from the Apollo missions indicate that lunar anorthosites are typically coarse grained and reach grain sizes larger than 1 cm. We present the extension of the current spectral databases by new spectral data of whole rock samples, crucial for the interpretation of current in situ/remote analyses for lunar and other planetary missions, as Hayabusa2 and OSIRIS-REx. Spectral data is recorded at the Planetary Spectroscopy Laboratory (PSL) of DLR in Berlin. The suite of samples selected for this work includes: - slabs and stone chunks of plagioclases such as anorthosite, diorite, monzodiorite, gabbro and diabas; - salts such as hexahydride; - iron meteorite samples, among them ataxites and octahedrites. Emissivity is measured in vacuum at 100° C, 200° C, 300° C and 400° C in the MIR and FIR spectral ranges. Thermally processed samples are measured in hemispherical and bi-directional reflectance in the full spectral range from UV to FIR. A sample of graphite (measured in emissivity under the same configuration and procedure as for the samples) is used to calibrate the sample emissivity.

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