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Conference Papers Year : 2021

Long distance observations of Jezero craters geological units by the SuperCam instrument onboard Perseverance/Mars2020

Lucia Mandon
Franck Montmessin
Thierry Fouchet
Jesse Tarnas
  • Function : Author

Abstract

On February 18, 2021, NASAs Mars 2020 Perseverance rover landed successfully in Jezero crater. Several geological and compositional units have previously been identified from orbital data analysis [1,2]: a dark pyroxene-bearing floor unit; an olivine-bearing unit exposed in erosional windows partially altered into phyllosilicates and carbonates [3]; a deltaic complex with possible remnants and marginal carbonate-bearing unit [1]. The SuperCam instrument contains a suite of techniques including passive spectroscopy in the 0.40-0.85 (VIS) and 1.3-2.6 microns (IR) wavelength ranges, and a camera (RMI- Remote Micro-Imager) providing high resolution context images [4]. Since the landing, SuperCam has acquired tens of observations on distant targets (from 10s of m to 20 km) with VISIR and RMI techniques. The IFOV of the RMI images ranges from ~100 microns at 10m to ~20 cm at 20 km allowing to solve objects from ~0.5 mm at 10 m to ~1m at 20 km and the VISIR FOV range from 1 cm to 20 m. Distant observations have been acquired on the western delta front, several mesas and hills, on Jezero floor unit (the unit perseverance landed on and investigated in situ), on the olivine-bearing erosional window, and on more distant targets such as the crater rim or marginal carbonate-bearing unit. The observed spectral signatures form different clusters depending on the type of target, confirming the spectral diversity of Jezero geological units. The western delta front and a residual butte informally named Kodiak are clustered together with spectral signatures in agreement with a mixture of olivine, pyroxene and hydrated phases. The spectra of the erosional window into the olivine bearing unit display the strongest red slope between 1.3 and 1.8 microns, suggesting the presence of olivine in both the exposed rocks and the surrounding soils and in addition, the rocks display a strong signature of hydrated phases. The long distance observations of the crater floor unit are in agreement with the spectral signature identified in the vicinity of the rover [5], which confirms the relevance of long distance observations to assess the geological/mineralogical context of Perseverances future traverse. References : [1] Horgan et al., 2020 [2] Goudge et al., 2015 [3] Tarnas, et al., 2019. [4] Wiens, et al., 2021. [5] Mandon et al., this conference
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Dates and versions

obspm-03903805 , version 1 (16-12-2022)

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Cathy Quantin Nataf, Lucia Mandon, Olivier Gasnault, Clement Royer, Pierre Beck, et al.. Long distance observations of Jezero craters geological units by the SuperCam instrument onboard Perseverance/Mars2020. AGU Fall Meeting 2021, Dec 2021, Nouvelle-Orléans, United States. ⟨obspm-03903805⟩
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