Mercury's Rotation Period: Photographic Confirmation

Details Mercury's Rotation Period: Photographic Confirmation Mercury's Rotation Period: Photographic Confirmation

Dec 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968sci...162.1275s&link_type=abstract

Science, Volume 162, Issue 3859, pp. 1275-1277

Physics

4

Scientific paper

Photographic measures of surface features on Mercury have led to a rotation period of 58.663 ± 0.021 days, which is in good agreement with the 58.646-day period required by a predicted 2:3 resonance between the axial and orbital periods. The incorrect interpretation of earlier visual and photographic observations which supported an 88-day rotation period appears to be partially explained by peculiar characteristics associated with the observability of various hermographic longitudes. The apparent contrast of most of the recorded surface features is marginal for visual observation when viewed through the terrestrial daytime sky. The intrinsic contrast of a relatively conspicuous feature was measured as 0.20, a value lower than that of typical markings observed on the moon and Mars.

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