The occultation of Mariner 10 by Mercury

Details The occultation of Mariner 10 by Mercury The occultation of Mariner 10 by Mercury

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...29..439f&link_type=abstract

Icarus, vol. 29, Dec. 1976, p. 439-444. NASA-supported research.

Physics

9

Mariner 10 Space Probe, Mercury (Planet), Planetary Atmospheres, Radio Occultation, Doppler Effect, Electron Density (Concentration), Gas Density, Radii, Superhigh Frequencies, Ultrahigh Frequencies

Scientific paper

Analysis of Mariner 10 dual-frequency radio-occultation recordings has yielded new information on the radius and atmosphere of Mercury. The ingress measurements, which were conducted near 1.1 deg north latitude and 67.4 deg east longitude on the night side of the planet, gave a value for the radius of 2439.5 + or - 1 km. Egress near 67.6 deg north latitude and 258.4 deg east longitude on the sunlit side yielded a radius of 2439.0 + or - 1 km. The atmospheric measurements showed the electron density to be less than 1000 per cu cm on both sides of the planet. From the latter result one may infer an upper limit to the dayside surface gas density of 1 million molecules per cu cm.

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