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The Heat Flow and Physical Properties Package HP3 on InSight: Status and First Results

Spohn, Tilman and Smrekar, S. and Grott, Matthias and Hudson, T.L. and Knollenberg, Jörg and Krause, Christian and Lichtenheldt, Roy and Schmelzbach, C. and Banerdt, W.B. (2019) The Heat Flow and Physical Properties Package HP3 on InSight: Status and First Results. AGU Fall Meeting, 9.12.-13.12.2019, San Francisco.

Full text not available from this repository.

Official URL: https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/536630

Abstract

The Heat Flow and Physical Properties Package HP3 in March 2019 started to deploy a self-burrowing probe to a depth of up to 5m, deep enough to reach beyond the temperature waves from diurnal and annual perturbations. The probe - nicknamed the mole - carries a tether to depth equipped with temperature sensors to measure the temperature gradient and houses a set of self-heated sensors to measure the thermal conductivity at depth at 50 cm intervals. It further includes a tiltmeter to measure the attitude upon penetration and a device to measure the length of tether buried. From the temperature gradient and the thermal conductivity, the planetary heat flow will be calculated. In addition, the package includes a radiometer, the results of which are presented in Müller et al. (2019) at this meeting. Unfortunately, the mole got stuck at a depth of 35cm. Interpretation of the available penetration data suggests that the mole punched through a duricrust of perhaps about 10cm thickness that provided significant initial resistance to the penetration. While the mole penetrated further to 35cm depth using the weight of its support structure to balance recoil, the duricrust and the regolith underneath failed to provide the necessary friction once the mole had left the support structure. By the time of the fall meeting, InSight will have attempted to use its robotic arm to break the duricrust, compact the porous regolith and load it to provide sufficient friction for further penetration, hopefully to the target depth. The pit that the mole has carved is twice as wide as the diameter of the mole. Together with the inclination of 20° of the mole axis with respect to gravity this suggests precession of the mole and/or lateral movement. Images of the pit further suggest that the duricrust fails upon being stressed and compacts significantly thus indicating a substantial porosity of the latter.

Item URL in elib:https://elib.dlr.de/132736/
Document Type:Conference or Workshop Item (Speech)
Title:The Heat Flow and Physical Properties Package HP3 on InSight: Status and First Results
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Spohn, TilmanTilman.Spohn (at) dlr.deUNSPECIFIED
Smrekar, S.suzanne.e.smrekar (at) jpl.nasa.govUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Hudson, T.L.jet propulsion laboratory, california institute of technology, pasadena, usaUNSPECIFIED
Knollenberg, JörgJoerg.Knollenberg (at) dlr.deUNSPECIFIED
Krause, ChristianChristian.Krause (at) dlr.deUNSPECIFIED
Lichtenheldt, RoyRoy.Lichtenheldt (at) dlr.dehttps://orcid.org/0000-0002-2539-4910
Schmelzbach, C.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIED
Banerdt, W.B.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Date:December 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:InSight Mars HP3 Heat Flow Instrument Regolith
Event Title:AGU Fall Meeting
Event Location:San Francisco
Event Type:international Conference
Event Dates:9.12.-13.12.2019
Organizer:American Geophysical Union
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 , Köln-Porz , Oberpfaffenhofen
Institutes and Institutions: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 System Dynamics and Control > Space System Dynamics
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:13 Dec 2019 10:16
Last Modified:13 Dec 2019 10:16

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