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Related Experiment Videos

Temperatures within comet nuclei.

S W Squyres1, C P McKay, R T Reynolds

  • 1NASA Ames Research Center, Moffett Field, California, USA.

Journal of Geophysical Research
|December 10, 1985
PubMed
Summary
This summary is machine-generated.

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Comet nucleus temperatures depend on material properties like porosity and pore size. Understanding these thermal profiles is key to exploring comets with spacecraft.

Area of Science:

  • Planetary Science
  • Cometary Science
  • Astrophysics

Background:

  • Cometary nuclei are complex icy bodies.
  • Subsurface temperature is crucial for understanding cometary activity and evolution.
  • Previous models often simplified the thermal processes within comets.

Purpose of the Study:

  • To theoretically investigate subsurface temperatures within a comet nucleus.
  • To model heat conduction and energy balance at the comet's surface and interior.
  • To determine how physical properties influence cometary thermal profiles.

Main Methods:

  • Solved the one-dimensional heat conduction equation for the comet's outer layers.
  • Incorporated surface energy balance including insolation, sublimation, and coma effects.

Related Experiment Videos

  • Modeled thermal conductivity considering grain conduction, radiation, and vapor diffusion.

    • Main Results:

    • Subsurface temperatures are highly sensitive to nucleus porosity, pore size, and compaction.
    • Deep equilibrium temperatures correlate with the temperature dependence of thermal conductivity.
    • Albedo, emissivity, latitude, and dust mantles also affect temperature profiles.

    Conclusions:

    • Physical properties significantly dictate comet nucleus thermal structure.
    • In situ thermal measurements can constrain nucleus material properties.
    • This research aids in planning and interpreting future comet exploration missions.