Spectroscopic observations of winds on Venus: I. Technique and data reduction |
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| Authors: | AT Young RA Schorn LDG Young D Crisp ES Barker |
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| Institution: | Department of Physics, Texas A & M University, College Station, Texas 77843, USA;Department of Astronomy, University of Texas at Austin, Austin, Texas 78712, USA |
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| Abstract: | We present out methods of measurement and reduction of high-dispersion photographic spectra of Venus. Our preliminary results are consistent with slow direct or no rotation at the level we sample, and disagree strongly with a 4-day retrograde rotation. A serious systematic error, which affects much published work, is due to blending of solar lines in the sky with those reflected from the planet. This always tends to produce a spurious retrograde “rotation.” Only data obtained in a dark sky, or daytime observations from which the sky lines have been accurately subtracted, can be relied upon. All such data give low wind speeds. |
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