20-EPN2-048: Heating effects on the spectral reflectance properties of carbonaceous chondrite meteorites

20-EPN2-048: Heating effects on the spectral reflectance properties of carbonaceous chondrite meteorites

Visit by Edward Cloutis, University of Winnipeg (Canada), to TA2 Facility 5 – DLR Planetary Spectroscopy Laboratory (Germany).
Dates of visit: 28 August -2 September 2022

Report Summary: Carbonaceous chondrites are likely derived from dark (C-class) asteroids. Sample return missions to dark asteroids (JAXA Hayabusa-2, OSIRIS-REx) will allow us to link specific meteorites to these possible parent bodies. The compositions of the sample return target asteroids (Ryugu and Bennu) are currently unknown, as are the compositions of other dark asteroids. Dark asteroids are important scientific targets because they may have delivered prebiotic organic molecules to the early Earth.To help address how we can determine the compositions of dark asteroids, particularly whether they are primitive, aqueously-altered, and/or heated, we conducted a series of experiments at PSL designed to address this.

Specifically, we performed heating experiments, in vacuum, on clay minerals present in carbonaceous chondrite meteorites, and measured their subsequent spectral reflectance properties, as well as on samples heated in previous experiments (clays, carbonaceous chondrites, carbonaceous chondrite analogues), focusing on the most diagnostic spectral feature relevant to dark asteroids – the 3 micron region hydroxyl/water absorption band. The results are still being analysed, but it appears that heating in vacuum and exposure to vacuum cause changes in the depth and shape of this absorption feature, as well as the albedo, spectral slope, and appearance of additional absorption features. The results of this study will provide important constraints into the composition and history of dark asteroids.


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20-EPN2-042: Investigation of type 2 ungrouped carbonaceous chondrites to shed light on their origin, formation, and evolution

20-EPN2-042: Investigation of type 2 ungrouped carbonaceous chondrites to shed light on their origin, formation, and evolution

Visit by Mehmet Yesiltas, Kirklareli University (Turkey) to TA2 Facility 5 – DLR Planetary Spectroscopy Laboratory (Germany).
Dates of visit: 27 June -1 July 2022

Report Summary:

In the TA call 2 of the Europlanet 2024 framework, both hemispherical and bidirectional
reflectance spectra were collected on a total of 13 meteorites. For each meteorite, spectral data were recorded between 0.2 μm and 25 μm.

The analysed meteorite samples included carbonaceous chondrites as well as non-
carbonaceous chondrites that contain carbonaceous clasts and phases. The meteorites
were measured as bulk, and the same 2 mm diameter for the incoming beam aperture was
used. These measurements and their results will provide additional insights on the infrared spectra of meteorites and their carbon content, which will help us better understand and constrain the composition of their respective parent asteroids.


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