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"In both instances the orbit track of the GRAIL spacecraft was angled by 120° relative to LRO's orbit, and the twin spacecraft passed below LRO in the lunar night. Since the LROC NAC is a line scanner, it builds up an image line-by-line, and depends on the spacecraft to orient its CCD sensor perpendicular to the ground path. In the case of the GRAIL images, LRO was not reoriented so the images are distorted, the slews added to the distortion. Using spacecraft ephemeris, the distorted image of GRAIL was corrected back to a normal geometry."
Podpis do obrazka poniżej: "GRAIL A (Ebb) in the uncorrected native geometry (top), and geometrically corrected (bottom), LROC NAC M1104211640 [NASA/GSFC/Arizona State University]."
Wątek: Lunar Reconnaissance Orbiter (LRO) (Przeczytany 91118 razy)