Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002assl..278...57o&link_type=abstract
Solar System Remote Sensing, p. 57
Other
Lunar Surface, Imaging Techniques, Clementine Spacecraft, Remote Sensing
Scientific paper
Several techniques have been used to estimate the opposition spike parameters of the lunar surface by Clementine data. The simplest way is averaging many images that contain the spacecraft shadow point (zero-phase-angle point) neglecting albedo variations, which anyhow remain after the averaging. More accurate way is to use a phase-ratio image, one component (one initial image) of which contains the zero-phase-angle point and the other one is obtained at larger phase angles. This technique is more precise as the phase-ratio images almost do not contain albedo variations. A drawback of both these approaches is strong dependence of final results on camera characteristics drift that was considerable during the mission. The third technique suggests to use images acquired almost simultaneously and containing the zero-phase-angle point. It allows to avoid problems with the drift of camera parameters. With that technique logarithmic derivatives of the phase function for each point of imaged surface can be calculated. For this purpose D/C color-ratio (from UVVIS (ultraviolet-visable) camera images) is used. A shortcoming of the technique is availability of slight variations of the D/C color-index (D = 0.95 micron and C = 0.90 micron) over the ratio image. We estimate here an opposition spike parameter for several small mare and adjacent highland regions of the lunar surface suggesting a new technique (that develops the third one), which is also free of the UVVIS camera characteristics drift. We have studied a near-equatorial region placed in the latitude range 8N - 8S at the 0.5E longitude (the lunar near-side).
Kaydash Vadim
Omelchenko Vitaliy V.
Shkuratov Yu.
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