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Related Experiment Videos

Methods for computing comet core temperatures.

C P McKay1, S W Squyres, R T Reynolds

  • 1NASA Ames Research Center, Moffett Field, California 94035, USA.

Icarus
|January 1, 1986
PubMed
Summary
This summary is machine-generated.

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This study derives analytic expressions to link comet surface temperature to core temperature, revealing thermal conductivity

Area of Science:

  • Planetary Science
  • Cometary Physics
  • Thermal Modeling

Background:

  • Cometary nuclei are complex thermal systems.
  • Understanding internal temperatures is crucial for cometary evolution models.

Purpose of the Study:

  • Derive general analytic expressions relating comet surface temperature to deep nucleus temperature.
  • Establish a method to estimate core temperature from surface temperature data.

Main Methods:

  • Developed general analytic expressions for spherically symmetric, layered comets in thermal equilibrium.
  • Analyzed the impact of thermal conductivity's temperature dependence on core temperature.
  • Solved analytically for an idealized isothermal, low-conductivity nucleus.

Main Results:

Keywords:
NASA Center ARCNASA Discipline Exobiology

Related Experiment Videos

  • Core temperature is directly related to surface temperature via the anti-derivative of thermal conductivity.
  • For an eccentric nucleus (0.5), core temperature was 3% colder than with constant conductivity.
  • The derived method provides a direct estimation of core temperature from surface measurements.

Conclusions:

  • Analytic expressions offer a direct link between observable surface temperatures and internal cometary nucleus temperatures.
  • Thermal conductivity's temperature dependence significantly influences core temperature estimations.
  • This approach enhances the accuracy of thermal models for comets.