Posted by David Arditti at 16:22 on 2010 Aug 06
Paul, according to WinJUPOS software, at the time you give, there were no satellite shadows on the disk. It would have been obvious if there had been anyway. Satellite shadows are quite large and intensely black, easily recognisable when you see one.The NEB currently contains both white ovals and dark brick-red spots. Longitude of the central meridian at the time you report is about 19 deg. (System II)A map made by Einaga on August 01 shows a dark spot in the NEB at II=85 and a white oval at II=100. Both of these would be, as you describe, to the East of the CM (following) at the time you give, so you could be referring to either of them, but it seems you are talking about the dark red spot.