论文信息 - Theoretical interpretation of infrared measurements at Deimos in the framework of crater radiation

Theoretical interpretation of infrared measurements at Deimos in the framework of crater radiation

Abstract Ground-based infrared photometric data of Deimos at 4.8, 10, and 20 μm are not consistent with the predictions by the standard thermal model (STM). Contrary to the STM which is a smooth surface model with an artificial beaming factor, this paper attempts to interpret the observations in the framework of a cratered surface model. Heat conduction and the ellipsoidal shape of Deimos are taken into account. The best fit to the observed fluxes is achieved at a relative crater density of 0.9 for nearly hemispherical craters (millimeter to centimeter scale) and a lunar-like heat conduction coefficient of the regolith. The resulting flux ratios observed flux/calculated flux are 0.86, 1.16, and 1.05 at 4.8, 10, and 20 μm, respectively.

E. Kührt | E. Kührt | B. Giese | B. Giese

[1] Richard J. Rudy,et al. A refined “standard” thermal model for asteroids based on observations of 1 Ceres and 2 Pallas , 1986 .

[2] L. Lebofsky. Wavelength dependence of IRAS asteroid diameters and albedos , 1989 .

[3] E. Kührt,et al. A thermal model of the Martian satellites , 1989 .

[4] L. Lebofsky,et al. Systematic biases in radiometric diameter determinations , 1989 .

[5] D. Buhl,et al. Reradiation and thermal emission from illuminated craters on the lunar surface , 1968 .

[6] O. Hansen. An explication of the radiometric method for size and albedo determination. [asteroid IR photometry] , 1977 .

[7] Robert H. Brown,et al. Ellipsoidal geometry in asteroid thermal models: The standard radiometric model , 1985 .

[8] D. Morrison,et al. Recalibration of the photometric/radiometric method of determining asteroid sizes , 1974 .

[9] Thomas C. Duxbury,et al. Phobos and Deimos control networks , 1989 .

[10] L. Lebofsky,et al. Radiometry and a thermal modeling of asteroids , 1989 .

[11] Bruce M. Jakosky,et al. Infrared observations of Phobos and Deimos from Viking , 1982 .

[12] J. Veverka,et al. Crater densities on the satellites of Mars , 1980 .

[13] D. Matson,et al. Radiometry of Deimos , 1987 .

[14] S. Squyres,et al. Methods for computing comet core temperatures. , 1986, Icarus.