Photometry of PHOBOS and Deimos from Viking orbiter images

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Deimos, Phobos, Viking Orbiter Spacecraft, Albedo, Brightness, Spaceborne Photography

Scientific paper

Images of Phobos and Deimos acquired by the Viking orbiter television system have been used to determine the photometric functions of the Martian moons. Data covering wavelengths from 445 nm to 593 nm and solar phase angles between 0.5 deg and 122 deg were used. Normal reflectances of 0.066 + or - 0.006 for Phobos and 0.069 + or - 0.006 for Deimos were determined. No variations in either photometric function or average normal albedo were observed over the wavelength range studied. The photometric functions demonstrate that the surface of Phobos and Deimos are intricate in texture brightness surges near opposition that are more pronounced than that of the moon.

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