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Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

From: First two-way laser ranging to a lunar orbiter: infrared observations from the Grasse station to LRO’s retro-reflector array

Fig. 8

Path of the Grasse station as seen from LRO. Each figure is for the four successful passes. Shown in the LRO spacecraft bus frame, an elevation of −90° represents the anti-nadir direction which is also the retro-reflector array normal. Elevations below ≈ −70° are within the LRA FOV. The points show the individual returns, colored by the residual (observed minus computed, in ns) with respect to the LRO trajectory (± 1 ns around the median)

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