Soyuz TMA-1 standard magnitude

From: Matson, Robert (
Date: Tue Oct 31 2000 - 15:34:59 PST

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    > I watched Soyuz TMA-1 pass through Sagittarius on 2000 Oct 31 at 23:06
    > I used 7x50 binoculars to see the spacecraft, which was about magnitude 6,
    at a
    > range of more than 600 km, and about 30 percent illuminated.
    That would translate to a standard magnitude of about +5.7 at
    the time the spacecraft passed above the crescent moon.  By the
    way, question for you, Ted.  Since your standard magnitudes are
    for 50% illumination, I wondered how they were derived.  You
    may have seen my post earlier about corrected equations for
    magnitude-dependence on phase angle.  I just wanted to make
    sure that the standard magnitude wasn't computed using 100%
    illumination and dividing the intensity by 2.  If they ~are~
    computed this way, then either my equation needs to be
    renormalized accordingly, or all your standard magnitudes
    must be dimmed (increased) by 0.49.
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