# Interior structure and seasonal mass redistribution of Mars from radio tracking of Mars Pathfinder.

@article{Folkner1997InteriorSA, title={Interior structure and seasonal mass redistribution of Mars from radio tracking of Mars Pathfinder.}, author={William M. Folkner and Charles Finney Yoder and Dah‐Ning Yuan and Erland Myles Standish and Robert A. Preston}, journal={Science}, year={1997}, volume={278 5344}, pages={ 1749-52 } }

Doppler and range measurements to the Mars Pathfinder lander made using its radio communications system have been combined with similar measurements from the Viking landers to estimate improved values of the precession of Mars' pole of rotation and the variation in Mars' rotation rate. The observed precession of -7576 +/- 35 milliarc seconds of angle per year implies a dense core and constrains possible models of interior composition. The estimated annual variation in rotation is in good…

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## References

SHOWING 1-10 OF 17 REFERENCES

Mars dynamics from Earth‐based tracking of the Mars Pathfinder lander

- Geology
- 1997

Measurements of Mars' rotational variations can be conducted via Earth-based radio tracking observations of the Mars Pathfinder lander during an extended mission. Two-way range measurements between…

An improved gravity model for Mars: Goddard Mars model 1

- Geology
- 1993

Doppler tracking data of three orbiting spacecraft have been reanalyzed to develop a new gravitational field model for the planet Mars, Goddard Mars Model 1 (GMM-1). This model employs nearly all…

Martian precession and rotation from Viking lander range data

- Geology
- 1997

The spatial orientation of the Martian pole of rotation and axial rotation parameters have been determined at a midpoint in the Viking epoch (January 1, 1980). The mean obliquity e and node ψ angles…

Meteorological effects on the seasonal variations of the rotation of Mars

- Geology
- 1981

We have investigated the meteorologically induced seasonal variations in the rotation rate of Mars. As on Earth, meteorological effects are expected to produce fluctuations in the rotation of Mars…

The moment of inertia and isostasy of Mars

- Physics
- 1977

The systematic and large deviation of the gravitational equipotential surface (EPS) of Mars from a spheroid of revolution suggests a description of Mars in terms of a spheroid nearly in isostatic…

Variations of Mars gravitational field and rotation due to seasonal CO2 exchange

- Physics
- 1990

About a quarter of the Martian atmospheric mass is exchanged between the atmosphere and the polar caps in the course of a Martian year: CO{sub 2} condenses to form (or add to) the polar caps in…

The interior structure of Mars: Implications from SNC meteorites

- Geology
- 1997

Two end-member models of Mars' present interior structure are presented: the first model is optimized to satisfy the geochemical data derived from the SNC meteorites in terms of the bulk chondritic…

The moments of inertia of Mars

- Physics
- 1989

The mean moment of inertia of Mars is, at present, very poorly constrained. The generally accepted value of 0.365 MR{sup 2} is obtained by assuming that the observed second degree gravity field can…

Climatic variations on Mars: 1. Astronomical theory of insolation

- Geology
- 1974

This paper describes variations in the solar insolation on Mars that result from oscillations of the orbital eccentricity (0.005 ≲ e ≲ 0.141) and the obliquity (14.9° ≲ θ ≲ 35.5°) of the planet.…

The moment of inertia of Mars

- Geology
- 1979

The non-hydrostatic contribution to the oblateness is calculated based on the single assumption that non-hydrostatic contributions to the moments-of-inertia are axially symmetric about the principal…