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Geodetic evidence that Mercury has a solid inner core.

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New geodetic analysis of MESSENGER spacecraft data reveals Mercury

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Area of Science:

  • Planetary Geodesy
  • Radio Science
  • Mercury Exploration

Background:

  • Understanding Mercury's internal structure and rotational dynamics is crucial for planetary science.
  • Previous models of Mercury's interior were limited by observational data.
  • The MESSENGER mission provided unprecedented radio tracking data for geodetic analysis.

Purpose of the Study:

  • To refine estimates of Mercury's gravity field, tidal Love number, and spin pole coordinates.
  • To determine Mercury's normalized polar moment of inertia and assess internal differentiation.
  • To constrain models of Mercury's internal structure, including the core.

Main Methods:

  • Geodetic analysis of radio tracking measurements from the MESSENGER spacecraft.
  • Determination of Mercury's spin pole coordinates (right ascension and declination).
  • Application of Markov-Chain Monte Carlo (MCMC) methods for internal structure modeling.

Main Results:

  • Precise measurements of Mercury's spin pole confirm its Cassini state and equilibrium.
  • Calculated mean obliquity (1.968 ± 0.027 arcmin) enabled determination of normalized polar moment of inertia (0.333 ± 0.005).
  • Internal structure models indicate a highly differentiated interior with a solid inner core.

Conclusions:

  • Mercury's geodetic parameters confirm its equilibrium state and high degree of internal differentiation.
  • The normalized polar moment of inertia suggests a substantial core relative to the planet's radius.
  • MCMC models constrain the inner core radius to be between 0.3 and 0.7 of the outer core radius.