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These four pictures were taken on 24th March 2005 with different filters. This first one was taken in natural light, that is only with an IR-blocking filter. Note the dark blue feature on the southern edge of the north equatorial belt (the upper of the two dark bands). This second one was taken in infra-red light; that is the IR-blocking filter was replaced by an IR-pass filter. The exposure was adjusted to give the same reading on the brightness meter in K3CCDTools as in the picture above. Note how the two satellites show up here when they didn't in the visible-light. Also the dark blue feature in the image above shows up well in the infra-red. This may be because the satellites have greater reflectivity in the infra-red, but equally may be caused by a change in the response of the camera when the gain is increased as was necessary for these pictures in the infra-red. This third picture was taken with a filter combination that isolated the red part of the spectrum Again the satellites do not show up. Finally this picture was taken specifically to image the planet. It was taken some 3 hours after the first in this series, and by then the GRS had come into view. | |
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