Re: Sunshine 3 magnitude

From: Tony Beresford (
Date: Thu Oct 04 2001 - 04:28:48 EDT

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    At 06:29 4/10/01 , you wrote:
    >Dear List,
    >        Does anyone have a magnitude estimate for the recently launched
    >Sunshine 3 satellite?
    Anthony firstly its Starshine 3.
    Secondly this was actually discussed quite thoroughly before the launch
    on this list. The 94cm diameter sphere is painted black for thermal reasons,
    and so bewten flashes from the mirrors you will need a telescope or large
    binoculars( 20x80 for example)  to see it. Flashes from the individual
    mirrors ( 2.5cm diameter) should reach 0 magnitude or better with optimum
    conditions,  based on the rule that 1 square meter of mirror at 1000km
    gives a -8 mag flash
    tony beresford
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