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The heat flow and physical properties package HP3 for the InSight mission

Spohn, Tilman and Grott, Matthias and Smrekar, S.E. and Knollenberg, J. and Hudson, T.L. and Krause, Christian and Müller, Nils and Jänchen, Judit and Börner, Anko and Wippermann, Torben and Krömer, Olaf and Lichtenheldt., Roy and Wiśniewski, Lukasz and Grygorczuk, Jurek and Fittock, Mark and Rheershemius, Sibo and Spröwitz, Tom and Kopp, Emanuel and Walter, Ingo and Plesa, A.-C and Breuer, Doris and Morgan, P. and Banerdt, W.B. (2018) The heat flow and physical properties package HP3 for the InSight mission. Space Science Reviews, 214 (96), pp. 96-128. Springer. DOI: 10.1007/s11214-018-0531-4 ISSN 0038-6308

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Abstract

The Heat Flow and Physical Properties Package HP3 for the InSight mission will attempt the first measurement of the planetary heat flow of Mars. The data will be taken at the InSight landing site in Elysium planitia (136 ◦E, 5 ◦N) and the uncertainty of the mea- surement aimed for shall be better than ±5 mW m−2 . The package consists of a mechanical hammering device called the “Mole” for penetrating into the regolith, an instrumented tether which the Mole pulls into the ground, a fixed radiometer to determine the surface brightness temperature and an electronic box. The Mole and the tether are housed in a support struc- ture before being deployed. The tether is equipped with 14 platinum resistance temperature sensors to measure temperature differences with a 1-σ uncertainty of 6.5 mK. Depth is de- termined by a tether length measurement device that monitors the amount of tether extracted from the support structure and a tiltmeter that measures the angle of the Mole axis to the local gravity vector. The Mole includes temperature sensors and heaters to measure the re- golith thermal conductivity to better than 3.5% (1-σ ) using the Mole as a modified line heat source. The Mole is planned to advance at least 3 m—sufficiently deep to reduce errors from daily surface temperature forcings—and up to 5 m into the martian regolith. After landing, HP3 will be deployed onto the martian surface by a robotic arm after choosing an instru- ment placement site that minimizes disturbances from shadows caused by the lander and the seismometer. The Mole will then execute hammering cycles, advancing 50 cm into the sub- surface at a time, followed by a cooldown period of at least 48 h to allow heat built up during hammering to dissipate. After an equilibrated thermal state has been reached, a thermal con- ductivity measurement is executed for 24 h. This cycle is repeated until the final depth of 5 m is reached or further progress becomes impossible. The subsequent monitoring phase consists of hourly temperature measurements and lasts until the end of the mission. Model calculations show that the duration of temperature measurement required to sufficiently re- duce the error introduced by annual surface temperature forcings is 0.6 martian years for a final depth of 3 m and 0.1 martian years for the target depth of 5 m.

Item URL in elib:https://elib.dlr.de/121308/
Document Type:Article
Title:The heat flow and physical properties package HP3 for the InSight mission
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Spohn, TilmanTilman.Spohn (at) dlr.deUNSPECIFIED
Grott, Matthiasmatthias.grott (at) dlr.deUNSPECIFIED
Smrekar, S.E.suzanne.e.smrekar (at) jpl.nasa.govUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Hudson, T.L.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Krause, Christianchristian.krause (at) dlr.deUNSPECIFIED
Müller, NilsNils.Mueller (at) dlr.deUNSPECIFIED
Jänchen, JuditJudit.Jaenchen (at) dlr.deUNSPECIFIED
Börner, Ankoanko.boerner (at) dlr.deUNSPECIFIED
Wippermann, TorbenTorben.Wippermann (at) dlr.dehttps://orcid.org/0000-0002-0354-6557
Krömer, Olafolaf.kroemer (at) dlr.deUNSPECIFIED
Lichtenheldt., Royroy.lichtenheldt (at) dlr.deUNSPECIFIED
Wiśniewski, LukaszASTRONIKA, Warschau, PolenUNSPECIFIED
Grygorczuk, JurekASTRONIKA, Warschau, PolenUNSPECIFIED
Fittock, MarkMark.Fittock (at) dlr.deUNSPECIFIED
Rheershemius, SiboUNSPECIFIEDUNSPECIFIED
Spröwitz, TomDLR, Bremen, tom.sproewitz (at) dlr.deUNSPECIFIED
Kopp, Emanuelemanuel.kopp (at) dlr.deUNSPECIFIED
Walter, Ingoingo.walter (at) dlr.deUNSPECIFIED
Plesa, A.-Cana.plesa (at) dlr.deUNSPECIFIED
Breuer, DorisDoris.Breuer (at) dlr.dehttps://orcid.org/0000-0001-9019-5304
Morgan, P.Colorado Geological Survey, Denver, USAUNSPECIFIED
Banerdt, W.B.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Date:6 August 2018
Journal or Publication Title:Space Science Reviews
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:214
DOI :10.1007/s11214-018-0531-4
Page Range:pp. 96-128
Editors:
EditorsEmail
Russel, ChrisUCLA
Banerdt, W.B.JPL
Publisher:Springer
ISSN:0038-6308
Status:Published
Keywords:Mars, InSight Mission, Wärmeflussmessung, Temperatur im Mars, Physikalische Eigenschaften des Marsbodens
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project InSight HP3
Location: Berlin-Adlershof , Bremen , Köln-Porz
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Asteroids and Comets
Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Optical Sensor Systems > Real-Time Data Processing
Institute of Space Systems > Land and Exploration Technology
Institute of System Dynamics and Control > Space System Dynamics
Institute of Space Systems > Mechanic and Thermal Systems
Institute of Optical Sensor Systems > Space Instruments
Deposited By: Spohn, Tilman
Deposited On:10 Sep 2018 15:57
Last Modified:23 Feb 2019 00:22

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