Experimental determination of Mercury's mass and oblateness

Details Experimental determination of Mercury's mass and oblateness Experimental determination of Mercury's mass and oblateness

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976cosp.meetq....e&link_type=abstract

COSPAR, Plenary Meeting, 19th, Philadelphia, Pa., June 8-19, 1976, Paper. 13 p.

Physics

Flyby Missions, Mariner 10 Space Probe, Mercury (Planet), Oblate Spheroids, Planetary Mass, Density Measurement, Gravitational Effects, Mass Ratios, Planetary Gravitation, Radiometers

Scientific paper

The ratio of the mass of the sun to that of Mercury deduced from the first and third flybys of Mercury by Mariner 10 is 6,023,600 plus or minus 600 and 6,023,700 plus or minus 300, respectively. Additional analysis should improve these uncertainties by a factor of 2 to 5. Assuming an equatorial radius of 2439 km, the mean density of the planet is 5.44 g/cu cm. The gravitational oblateness deduced from the first encounter is discussed. Data received from the third encounter are better suited for this determination and yield J2 of 0.00008 plus or minus 0.00006. In addition, the third-encounter data are sensitive to local gravity effects or anomalies.

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