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The occultation of Epsilon Geminorum by Mars - Analysis of McDonald dataAn analysis of observations of the occultation of Epsilon Gem by Mars on April 8, 1976, is presented. The data were obtained by three neighboring telescopes at McDonald Observatory. Intensity fluctuations on time scales of the order of 100 ms were observed simultaneously at the three telescopes. As the observations compare well with predictions of turbulent scintillation theory, it is concluded that such fluctuations were probably largely the effect of stellar scintillations in the Martian atmosphere. The stellar diameter is included as a parameter in the theory but in a way which differs from previously published interpretations of occultations of extended sources by planetary atmospheres. Scintillations govern the experimental uncertainty in the deduction of the scale height of the high Martian atmosphere. A density scale height of 9.9 + or - 2.5 km is obtained at an altitude of 74 + or - 8 km above the mean surface. For CO 2 gas, this result corresponds to a temperature of 190 + or - 50 K.
Document ID
19770052275
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Africano, J. (Texas Univ. Austin, TX, United States)
De Vaucouleurs, G. (Texas Univ. Austin, TX, United States)
Evans, D. S. (Texas Univ. Austin, TX, United States)
Finkel, B. E. (Texas Univ. Austin, TX, United States)
Nather, R. E. (Texas Univ. Austin, TX, United States)
Palm, C. (Texas Univ. Austin, TX, United States)
Silverberg, E. (Texas Univ. Austin, TX, United States)
Wiant, J. (Texas, University Austin, Tex., United States)
Hubbard, W. B. (Texas Univ. Austin, TX, United States)
Jokipii, J. R. (Arizona, University Tucson, Ariz., United States)
Date Acquired
August 9, 2013
Publication Date
June 15, 1977
Publication Information
Publication: Astrophysical Journal
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NSG-7101
CONTRACT_GRANT: NSF AST-74-23135
CONTRACT_GRANT: NSG-7045
Distribution Limits
Public
Copyright
Other