[FPSPACE] Chang'e-2 -- why the silence?

Paolo Ulivi pao.ulivi at gmail.com
Tue Jan 8 06:02:56 EST 2013

there should be a total of at least 500 pics taken during the flyby. I
hope that they will someday archive them online as they did for Moon
images - see
observations by other instruments (radiometer and laser altimeter) had
been announced, but as they have common boresight as the science
camera, which apparently was not used, they were not used either.
I collected a few info on the monitoring cameras on CE-2 and they
apparently cleverly choose to use the only camera with a field of view
narrow enough (7.2 degrees, the other cameras had wide angle, fisheye
hopefully we will know more when they present some result at next
week's SBAG and at the LPSC in March.

On Tue, Jan 8, 2013 at 11:41 AM, Geert Sassen <geert at navtools.nl> wrote:
> As far as I know several pictures have been taken, at least one more,
> close-up, picture was shown on Chinese TV and probably there are more.
> Other instrumentation was not activated, as has been stated in several
> media. In fact, the pictures were taken with one of the engineering camera's
> (the one which was originally used to picture the deployment sequence of the
> solar panels). The real observation camera in the science package was not
> used as this is a push-broom type of camera (like most similar camera's)
> which would have required the whole spacecraft to slew in order to make
> correct images (as Mars Express did during Phobos encounters). This is a
> more complicated manoeuvre and would have resulted in only one or two
> pictures at the very most, and even then only if they managed to pinpoint
> the target good enough to get it into the camera view. Using the engineering
> camera was a 'quick and dirty' method of getting images, but it did require
> a very close passage as this camera was obviously never intended for
> tele-shots of faraway targets.
> As I see it, the whole encounter was primarily a engineering-test for
> similar missions in the future, not much science results were expected.
> Regards,
> Geert Sassen.
> On Tuesday, January 8, 2013, James Oberg wrote:
>> So, a month after a sensationally-impressive asteroid fly-by, and not
>> another peep out of the Chinese news media? ONE photograph returned, no
>> other instrumentation active? Even then it's worth celebrating rather than
>> forgetting about completely.
>> What are we missing?
> --
> Geert Sassen
> http://www.facebook.com/geert.sassen
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