1. March 2019

Good luck ‘Mole’ – DLR’s HP3 experiment starts hammering into the Martian soil

HP3 on the Martian surface
HP3 on the Martian surface
Image 1/1, Credit: NASA/JPL-Caltech/DLR.

HP3 on the Martian surface

DLR's Mars 'Mole' HP3 on the Martian surface after being released by the InSight lander's robotic arm.

  • DLR's HP³ (Heat Flow and Physical Properties Package) burrows into the Martian soil for the first time.
  • The rod-shaped penetrometer uses a fully automatic, electrically powered hammer mechanism to drive itself into the subsurface.
  • Focus: Space, exploration

On 28 February 2019, the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) ‘Mole’ fully automatically hammered its way into the Martian subsurface for the first time. In a first step, it penetrated to a depth between 18 and 50 centimetres into the Martian soil with 4000 hammer blows over a period of four hours. "On its way into the depths, the mole seems to have hit a stone, tilted about 15 degrees and pushed it aside or passed it," reports Tilman Spohn, Principal Investigator of the HP3 experiment. "The Mole then worked its way up against another stone at an advanced depth until the planned four-hour operating time of the first sequence expired. Tests on Earth showed that the rod-shaped penetrometer is able to push smaller stones to the side, which is very time-consuming.

After a cooling-off period, the researchers will command a second four-hour hammering sequence. In the following weeks, with further intervals, they want to reach a target depth of three to five metres on sufficiently porous ground. The Mole will pull a five-metre-long tether equipped with temperature sensors into the Martian soil behind it. The cable is equipped with 14 temperature sensors in order to measure the temperature distribution with depth and its change with time after reaching the target depth and thus the heat flow from the interior of Mars.

Millimetre precision with a worm gear

The rod-shaped penetrometer uses a fully automatic, electrically powered hammer mechanism to drive itself into the subsurface. A rotating worm gear repeatedly stretches the main spring, which then produces a hammer blow. A second spring absorbs the recoil. “You can imagine the Mars Mole functioning like a large nail that has a built-in hammer,” says Torben Wippermann from the DLR Institute of Space Systems, explaining the technology.

Hammering, cooling, heating, measuring

The probe pauses after each step for about three Mars days (sols). It cools down for about two days after several hours of hammering, which causes friction and generates heat. Then, it measures the thermal conductivity of the soil at a sufficient depth for one day. “For this purpose, a piece of foil in the shell of the Mole is heated for several hours with a known electrical power,” says DLR planetary researcher Matthias Grott. “The simultaneously measured increase in the temperature of the foil then gives us a measure of the thermal conductivity of the soil in its immediate surroundings.” In addition, the radiometer mounted on the InSight lander measures the temperature of the Martian soil on the surface, which fluctuates from some degrees above zero degrees Celsius to almost -100 degrees Celsius. Later on, once the target depth has been reached, the data from the temperature and thermal conductivity measurements, along with the radiometer data, is received at the DLR control centre in Cologne, processed and then evaluated by scientists at the DLR Institute of Planetary Research.

The HP³ Instrument instrument on NASA’s InSight mission

The InSight mission is being carried out by NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California, on behalf of the agency’s Science Mission Directorate. InSight is part of NASA’s Discovery Program. DLR is contributing the Heat Flow and Physical Properties Package (HP³) experiment to the mission. The scientific leadership lies with the DLR Institute of Planetary Research, which was also in charge of developing and implementing the experiment in collaboration with the DLR Institutes of Space Systems, Optical Sensor Systems, Space Operations and Atronaut Training, Composite Structures and Adaptive Systems, and System Dynamics and Control, as well as the Institute of Robotics and Mechatronics. Participating industrial partners are Astronika and the CBK Space Research Centre, Magson GmbH and Sonaca SA, the Leibniz Institute of Photonic Technology (IPHT) as well as Astro- und Feinwerktechnik Adlershof GmbH. Scientific partners are the ÖAW Space Research Institute at the Austrian Academy of Sciences and the University of Kaiserslautern. The DLR Microgravity User Support Center (MUSC) in Cologne is responsible for HP³ operations. In addition, the DLR Space Administration, with funding from the German Federal Ministry for Economic Affairs and Energy, supported a contribution by the Max Planck Institute for Solar System Research to the French main instrument SEIS (Seismic Experiment for Interior Structure).

Detailed information on the InSight mission and the HP³ experiment is available on DLR’s dedicated mission site with extensive background articles. You can also find information in the animation and brochure about the mission or via the hashtag #MarsMaulwurf on the DLR Twitter channel. Tilman Spohn, the Principal Investigator for the HP³ experiment, is also providing updates in the DLR Blog portal about the activities of the Mars Mole.

Contact
  • Falk Dambowsky
    Editor
    German Aerospace Center (DLR)
    Media Relations
    Telephone: +49 2203 601-3959
    Fax: +49 2203 601-3249
    Linder Höhe
    51147  Cologne
    Contact
  • Christian Krause
    German Aerospace Center (DLR)

    Microgravity User Support Center (MUSC), Space Operations and Astronaut Training
    Telephone: +49 2203 601-3048
    Linder Höhe
    51147  Köln
    Contact
  • Torben Wippermann
    German Aerospace Center (DLR)
    Institute of Space Systems
    Telephone: +49 421 24420-1120
    Robert-Hooke-Straße  7
    28359 Bremen
  • Dr Roy Lichtenheldt
    German Aerospace Center (DLR)
    System Dynamics and Control
    Telephone: +49 8153 28-3095
    Fax: Institute of System Dynamics and Control
     
  • Dr.-Ing. Björn Timo Kletz
    German Aerospace Center (DLR)

    DLR Institute of Composite Structures and Adaptive Systems
    Telephone: +49 531 295-3228
    Fax: +49 531 295-2876
    Lilienthalplatz 7
    38108 Braunschweig
    Contact
  • Prof.Dr. Tilman Spohn
    HP³ Principal Investigator
    German Aerospace Center (DLR)

    DLR Institute of Planetary Research
    Telephone: +49 30 67055-300
    Fax: +49 30 67055-303
    Linder Höhe
    51147  Köln
    Contact
  • Matthias Grott
    German Aerospace Center (DLR)
    Institute of Planetary Research
    HP³ project scientist and InSight science team member; Focus on heat flow and thermal conductivity measurements; Instrument development
    Rutherfordstraße 2
    12489  Berlin
    Contact
  • Dr Anko Börner
    German Aerospace Center (DLR)
    DLR Institute of Optical Sensor Systems
    Institute of Optical Sensor Systems
    Telephone: +49 30 67055-509
    Rutherfordstraße 2
    12489  Berlin-Adlershof
  • Dr. Martin Knapmeyer
    German Aerospace Center (DLR)
    Institute of Planetary Research
    Telephone: +49 30 67055-394
    Rutherfordstraße 2
    12489  Berlin
    Contact
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