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Comparison among the in-situ thermal properties measurements on InSight and Phoenix and laboratory measurements on Mars regolith simulant

Nagihara, S. and Ngo, Peter and garcia, M.A. and Grott, Matthias (2023) Comparison among the in-situ thermal properties measurements on InSight and Phoenix and laboratory measurements on Mars regolith simulant. 54th Lunar and Planetary Science Conference, 2023-03-13 - 2023-03-17, The Woodlands.

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Official URL: https://www.hou.usra.edu/meetings/lpsc2023/pdf/1258.pdf

Abstract

The Phoenix mission was the first to measure the thermal properties of regolith of Mars in situ. The Thermal and Electrical Conductivity Probe (TECP) was inserted to the surface regolith by the robotic arm of the spacecraft at 7 locations andobtained several repeated measurements of thermal conductivity and volumetric heat capacity for a duration of 1 to 2 sols at each location. Volumetric heat capacity is a product of density and specific heat. Nearly a decade later, the first heat flow measurement on Mars was attempted on the InSight mission. The Heat flow and Physical Properties Package (HP3), unfortunately, penetrated only ~35 cm into the regolith, not deep enough to obtain the thermal gradient representative of the heat flow from the martian interior. However, HP3 repeatedly measured in-situ thermal conductivity of the regolith over a duration of a Martian year and observed its seasonal variation. The average of the thermal conductivities reported from Phoenix (0.085 W/m/K) is more than twice as that of InSight (0.038 W/m/K). Here we discuss possible implications of these results by also comparing them to laboratory measurements on Mars regolith simulant conducted under Mars-like atmospheric conditions.

Item URL in elib:https://elib.dlr.de/194625/
Document Type:Conference or Workshop Item (Poster)
Title:Comparison among the in-situ thermal properties measurements on InSight and Phoenix and laboratory measurements on Mars regolith simulant
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Nagihara, S.Texas Tech Univ.UNSPECIFIEDUNSPECIFIED
Ngo, PeterHoneybee RoboticsUNSPECIFIEDUNSPECIFIED
garcia, M.A.Honeybee RoboticsUNSPECIFIEDUNSPECIFIED
Grott, MatthiasUNSPECIFIEDhttps://orcid.org/0000-0002-8613-7096UNSPECIFIED
Date:2023
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2806
Page Range:p. 1258
Series Name:LPI Contribution
Status:Published
Keywords:Mars regolith thermal conductivity
Event Title:54th Lunar and Planetary Science Conference
Event Location:The Woodlands
Event Type:international Conference
Event Start Date:13 March 2023
Event End Date:17 March 2023
Organizer:Lunar and Planetary Institute
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project InSight - HP3
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Sensor Systems
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:25 Apr 2023 11:49
Last Modified:24 Apr 2024 20:55

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