urn:nasa:pds:context:instrument:hp3.insight 1.0 1.10.1.0 Product_Context HP3 2018-07-12 1.0 Post-peer-review version urn:nasa:pds:context:instrument_host:spacecraft.insight instrument_to_instrument_host Heat Flow and Physical Properties Package Regolith Properties Thermal Probe The Heat Flow and Physical Properties Package (HP3) will make in-situ measurements of the heat flow on Mars. The package includes a "mole", which will hammer itself into the subsurface for up to 5 meters. The mole is attached to a tether that contains temperature sensors to determine the thermal gradiant. The mole is also equipped with heating foils, which will be used to determine the thermal conductivity of the regolith.