Re: ISS Misses Moon - not by much!

From: Bruno Tilgner (
Date: Thu Jun 07 2001 - 08:25:14 PDT

  • Next message: Mike Waterman: "Re: ISS Misses Moon - not by much!"

    >What about seeing a more constant source of light, like the sun reflected
    >off any of the satellites that are let's say magnitude 4 or brighter. I
    >realize that earthshine is not always the same brightness and that past a
    >few days it's not even noticeable, but it wouldn't it be much more likely to
    >see this than trying to see a flare crossing the moon's disc?
    I am not sure I understand what you mean. If you are referring to an
    object of magnitude 4 or brighter crossing the Moon's disk, yes this
    is a lot more likely to happen, although it would be a relatively
    rare event as well. However, I don't see how eartshine enters into
    the picture. Normally, it is negligible.
    The real challenge is to see a dark satellite in front of the Moon.
    This would be sometime in the middle of the night. As far as I know,
    it has never been observed and it probably cannot be observed except
    for large objects like ISS or the Shuttle.
    A somewhat similar situation occurs for transits in front of the
    Sun. The only verifiable observation I am aware of is the video
    of ISS taken by Ron Dantowitz last December in Canada during the
    partial solar eclipse. Quite a feat!
    Bruno Tilgner
    48.85N 2.02E UTC+2
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