Results of TV imaging of PHOBOS - Experiment VSK-Fregat

Details Results of TV imaging of PHOBOS - Experiment VSK-Fregat Results of TV imaging of PHOBOS - Experiment VSK-Fregat

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..281a&link_type=abstract

(Colloquium on Phobos-Mars Mission, Paris, France, Oct. 23-27, 1989, Proceedings. A91-29558 11-91) Planetary and Space Science (

Computer Science

23

Phobos, Planetary Craters, Satellite Imagery, Satellite Surfaces, Television Cameras, Brightness Temperature, Charge Coupled Devices, Imaging Spectrometers, Meteorite Craters, Mars, Satellites, Phobos, Spacecraft Observations, Phobos 2 Mission, Vsk Instrument, Surface, Features, Brightness, Crater Rims, Grooves, Wavelengths, Visible Wavelengths, Near-Infrared, Equipment, Spectrometry, Diagrams, Color, Reflectance, Origin, Formation, Density, Photometry, Craters, Distribution, Ejecta, Optical Properties

Scientific paper

From February to March 1989 the Phobos 2 spacecraft took 37 TV images of Phobos at a distance of 190-1100 km. These images complement Mariner-9 and Viking data by providing higher-resolution coverage of a laarge region west of the crater Stickney (40-160 deg W) and by providing disk-resolved measurements of surface brightness at a greater range of wavelengths and additional phase angles. These images have supported updated mapping and characterization of large craters and grooves, and have provided additional observations of craters' and grooves' bright rims. Variations in surface visible/near-infrared color ratio of almost a factor of 2 have been recognized; these variations appear to be associated with the ejecta of specific large impact craters. Updated determinations of satellite mass and volume allow calculation of a more accurate value of bulk density, 1.90 + or - 0.1 g/cu cm. This is sigificantly lower than the density of meteoritic analogs to Phobos' surface, suggesting a porous interior perhaps containing interstitial ice.

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