منابع مشابه
Phobos and Deimos
Once the Galilean satellites of Jupiter were discovered and the Copernican model of the solar system became widely accepted, Mars’ apparent lack of a moon was notable. By the end of the seventeenth century, Saturn was known to have at least five satellites, a number that swelled to seven by the end of the eighteenth century. By 1800 a new planet, Uranus, was discovered and found to have at leas...
متن کاملInfrared Observations of Phobos and Deimos From Viking
The surface thermal properties of Phobos and Deimos have been determined from observations made with the Viking Orbiter Infrared Thermal Mapper (IRTM), at wavelengths ranging from 6 to 20 •m. The data, composed of both global and high-resolution infrared photometry of the satellite surfaces as well as eclipse observations, indicate surface material of low thermal conductivity comparable to that...
متن کاملSpacecraft exploration of Phobos and Deimos
We review the previous exploration of Phobos and Deimos by spacecraft. The first close-up images of Phobos and Deimos were obtained by the Mariner 9 spacecraft in 1971, followed by much image data from the two Viking orbiters at the end of the 70s, which formed the basis for early Phobos and Deimos shape and dynamic models. The Soviet Phobos 2 spacecraft came within 100 km of landing on Phobos ...
متن کاملFormation of Phobos and Deimos via a giant impact
Although the two moons of Mars, Phobos and Deimos, have long been thought to be captured asteroids, recent observations of their compositions and orbits suggest that they may have formed from debris generated by one or more giant impacts of bodies with $0.01Â target mass. Recent studies have both analytically estimated debris produced by giant impacts on Mars and numerically examined the evolut...
متن کاملSpectral absorptions on Phobos and Deimos in the visible/near infrared wavelengths and their compositional constraints
Absorption features on Phobos and Deimos in the visible/near infrared wavelength region (0.4–3.9 lm) are mapped using observations from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM). Fe electronic absorptions diagnostic of olivine and pyroxene are not detected. A broad absorption centered around 0.65 lm within the red spectral units of both moons is detected, and this feature...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200809498