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Longitudinal variations, the opposition effect and monochromatic albedos for Mars*

Published online by Cambridge University Press:  14 August 2015

William M. Irvine ,
James C. Higdon  and
Susan J. Ehrlich
William M. Irvine
Affiliation:
Dept. of Physics and Astronomy, University of Massachusetts, Amherst, Mass., U.S.A.
James C. Higdon
Affiliation:
Dept. of Physics and Astronomy, University of Massachusetts, Amherst, Mass., U.S.A.
Susan J. Ehrlich
Affiliation:
Smith College, Northhampton, Mass., U.S.A.

Abstract

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Observations of Mars previously reported in 10 narrow bands between 3150 Å and 1.06 μ and in UBV are analyzed for brightness variations which correlate with longitude of the central meridian. Such an effect is found for λ ≥ 5000 Å, with some evidence for such a correlation at λ = 4570 Å. The data are then corrected to the mean (over longitude) brightness and a linear phase curve fitted to those observations with phase angle i ≥ 15°. An opposition effect (anomalous brightening at small phase angles) is found for wavelengths λ ≤ 5500 Å, in contrast to a result previously reported. The magnitude at zero phase, phase coefficient, and monochromatic albedo are computed for Mars as a function of wavelength.

Type
Part II: Mars
Information
Symposium - International Astronomical Union , Volume 40: Planetary Atmospheres , 1971 , pp. 141 - 155
Copyright
Copyright © Reidel 1971 

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