Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974aj.....79.1457m&link_type=abstract
Astronomical Journal, vol. 79, Dec. 1974, p. 1457-1464.
Astronomy and Astrophysics
Astronomy
4
Brightness Temperature, Infrared Radiation, Mercury (Planet), Phase Shift, Planetary Radiation, Astronomical Models, Lunar Surface, Planetary Surfaces, Planetary Temperature, Thermal Emission
Scientific paper
Predictions based on a smooth spherical blackbody do not agree with the observed brightness temperatures of the planet Mercury. The curves of measured effective brightness temperature as a function of phase angle are more steep than and reach lower values near absolute values of i of about 180 deg and higher values near absolute values of i of about 0 deg than those of a smooth sphere. Phase curves of the moon have also been obtained which confirm earlier measurements. The distribution of Mercury's emitted energy in wavelength is dependent upon phase angle, changing from clearly identifiable thermal spectra for absolute values of i less than 150 deg to a superposition of thermal emission at several color temperatures for greater phase angles. No significant variation of infrared brightness temperature with subearth longitude intensity was found. These results provide further evidence that the surfaces of Mercury and the moon are similar and that the top layer of the planetary terrain is rough on a millimeter scale.-
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